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Promoting Irish Culture and History from Little Rock, Arkansas, USA

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Birth of Robert Boyle, Philosopher, Writer & Chemist

Robert Boyle, Anglo-Irish natural philosopher, theological writer, chemist, physicist, inventor and a preeminent figure of 17th-century intellectual culture, is born on January 25, 1627 at Lismore Castle, in County Waterford.

At age eight, Boyle begins his formal education at Eton College, where his studious nature quickly becomes apparent. In 1639 he and his brother Francis embark on a grand tour of the continent together with their tutor Isaac Marcombes. In 1642, owing to the Irish rebellion, Francis returns home while Robert remains with his tutor in Geneva and pursues further studies.

Boyle returns to England in 1644, where he takes up residence at his hereditary estate of Stalbridge in Dorset. There he begins a literary career writing ethical and devotional tracts, some of which employ stylistic and rhetorical models drawn from French popular literature, especially romance writings. In 1649 he begins investigating nature via scientific experimentation. From 1647 until the mid-1650s, he remains in close contact with a group of natural philosophers and social reformers gathered around the intelligencer Samuel Hartlib. This group, the Hartlib Circle, includes several chemists who heighten his interest in experimental chemistry.

Boyle spends much of 1652–1654 in Ireland overseeing his hereditary lands and performing some anatomic dissections. In 1654 he is invited to Oxford, and he takes up residence at the university until 1668. In Oxford he is exposed to the latest developments in natural philosophy and becomes associated with a group of notable natural philosophers and physicians, including John Wilkins, Christopher Wren, and John Locke. These individuals, together with a few others, form the “Experimental Philosophy Club.” Much of Boyle’s best known work dates from this period.

In 1659 Boyle and Robert Hooke, the clever inventor and subsequent curator of experiments for the Royal Society, complete the construction of their famous air pump and use it to study pneumatics. Their resultant discoveries regarding air pressure and the vacuum appear in Boyle’s first scientific publication, New Experiments Physico-Mechanicall, Touching the Spring of the Air and Its Effects (1660). Boyle and Hooke discover several physical characteristics of air, including its role in combustion, respiration, and the transmission of sound. One of their findings, published in 1662, later becomes known as “Boyle’s law.” This law expresses the inverse relationship that exists between the pressure and volume of a gas, and it is determined by measuring the volume occupied by a constant quantity of air when compressed by differing weights of mercury.

Among Boyle’s most influential writings are The Sceptical Chymist (1661), which assails the then-current Aristotelian and especially Paracelsian notions about the composition of matter and methods of chemical analysis, and the Origine of Formes and Qualities (1666), which uses chemical phenomena to support the corpuscularian hypothesis. He argues so strongly for the need of applying the principles and methods of chemistry to the study of the natural world and to medicine that he later gains the appellation of the “father of chemistry.”

Boyle is a devout and pious Anglican who keenly champions his faith. He sponsors educational and missionary activities and writes a number of theological treatises. He is deeply concerned about the widespread perception that irreligion and atheism are on the rise, and he strives to demonstrate ways in which science and religion are mutually supportive. For Boyle, studying nature as a product of God’s handiwork is an inherently religious duty. He argues that this method of study would, in return, illuminate God’s omnipresence and goodness, thereby enhancing a scientist’s understanding of the divine. The Christian Virtuoso (1690) summarizes these views and may be seen as a manifesto of his own life as the model of a Christian scientist.

In 1668 Boyle leaves Oxford and takes up residence with his sister Katherine Jones, Vicountess Ranelagh, in her house on Pall Mall in London. There he sets up an active laboratory, employs assistants, receives visitors, and publishes at least one book nearly every year. Living in London also provides him the opportunity to participate actively in the Royal Society.

Boyle is a genial man who achieves both national and international renown during his lifetime. He is offered the presidency of the Royal Society and the episcopacy but declines both. Throughout his adult life, he is sickly, suffering from weak eyes and hands, recurring illnesses, and one or more strokes. He dies in London at age 64 on December 31, 1691 after a short illness exacerbated by his grief over Katherine’s death a week earlier. He leaves his papers to the Royal Society and a bequest for establishing a series of lectures in defense of Christianity. These lectures, now known as the Boyle Lectures, continue to this day.

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Birth of Physicist Daniel Joseph Bradley

Daniel Joseph Bradley, physicist and Emeritus Professor of Optical Electronics at Trinity College, Dublin, is born on January 18, 1928 in Derry, County Londonderry, Northern Ireland.

Bradley is one of four surviving children of John and Margaret Bradley, Lecky Road, Derry. He leaves school to work as a telegraph boy but returns to education at St. Columb’s College. Following training as a teacher at St. Mary’s Training College, Belfast, he qualifies in 1947. While teaching in a primary school in Derry he studies for a degree in mathematics as an external student of the University of London, and is awarded a degree in 1953.

Moving to London where he teaches mathematics in a grammar school, Bradley decides to register for an evening course at Birkbeck College. His first choice is mathematics but as he already has a degree in the subject the admissions staff suggests that he study physics. In 1957, after four years of part-time study, he is awarded a Bachelor of Science degree in physics by Birkbeck, achieving the highest marks in his final exams in the University of London overall. He next joins Royal Holloway College as an assistant lecturer and simultaneously enrolls as a PhD student, working on Fabry–Pérot interferometer etalon-based high-resolution spectroscopy supervised by Samuel Tolansky. He receives a PhD in 1961.

Bradley is a pioneer of laser physics, and his work on the development of ultra-fast pulsed lasers adds a new and vitally important element to the capabilities of this new type of light source. In particular, working on dye lasers, he produces pulses of light as short as one picosecond (one picosecond is to a second as a second is to 31,800 years). His work paves the way for the completely new field of non-linear optical interactions. In addition, he inspires a new generation of laser scientists in Ireland and the UK, many of whom are international leaders in their fields.

Appointed to a lectureship in the physics department at Imperial College London, Bradley sets up a research programme in UV solar spectroscopy using rocket technology to reach high altitudes.

In 1963 Bradley begins work in laser physics but returns to Royal Holloway College as a reader one year later. In 1966 he is appointed professor and head of department at Queen’s University, Belfast. There he quickly establishes a space research group of international standing to do high-resolution solar spectroscopy. He attracts significant funding from a variety of agencies, allowing him to build his department into one of the world’s leading laser research centres, involving a total of 65 scientists. However, he leaves Belfast because of fears for his family’s safety as political violence escalates in the early 1970s amidst The Troubles.

Bradley returns to Imperial College London in 1973 to a chair in laser physics and heads a group in optical physics, laser physics and space optics. He is head of the Physics department from 1976 to 1980 but is frustrated by cutbacks and a rule governing the ratio of senior to junior positions, one consequence of which is that he is unable to maintain a long-established chair in optical design. He is also critical of the college administration’s handling of some departmental grant applications. He resigns in 1980 and moves to Dublin.

Among Bradley’s many lasting contributions to laser research in the UK is the setting up of one of the world’s leading research facilities for laser research, the Central Laser Facility at the Rutherford Appleton Laboratory (RAL).

Arriving at Trinity College, Dublin, Bradley decides the time is ripe to move on from laser research and development into laser applications. In 1982, with Dr. John Kelly, a chemist, and Dr. David McConnell, a geneticist, he forms a team which wins funding for a project using laser techniques to explore the structure of organic molecules like DNA and proteins. Unfortunately, however, his work at Trinity is cut short by ill health and he retires in 1984. His research on semiconductor lasers is carried on and this work on developing widely tuneable lasers for optical communications systems continues.

A member of the Royal Irish Academy, Bradley is Fellow Emeritus of Trinity College Dublin, and holds fellowships of the Royal Society, The Optical Society of America and Institute of Physics. Through time the ravages of his illness restricts his travelling and eventually he is cared for in a residential home in Dublin, where he passes away on February 7, 2010.

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Birth of John Tyndall, Experimental Physicist

File source: // Tyndall, Irish experimental physicist who, during his long residence in England, is an avid promoter of science in the Victorian era, is born on August 2, 1820 in Leighlinbridge, County Carlow.

Tyndall is born into a poor Protestant Irish family. After a thorough basic education he works as a surveyor in Ireland and England from 1839 to 1847. When his ambitions turns from engineering to science, he spends his savings on gaining a Ph.D. from the University of Marburg in Marburg, Hesse, Germany (1848–1850), but then struggles to find employment.

In 1853 Tyndall is appointed Professor of Natural Philosophy at the Royal Institution, London. There he becomes a friend of the much-admired physicist and chemist Michael Faraday, entertains and instructs fashionable audiences with brilliant lecture demonstrations rivaling the biologist Thomas Henry Huxley in his popular reputation and pursuing his research.

An outstanding experimenter, particularly in atmospheric physics, Tyndall examines the transmission of both radiant heat and light through various gases and vapours. He discovers that water vapor and carbon dioxide absorb much more radiant heat than the gases of the atmosphere and argues the consequent importance of those gases in moderating Earth’s climate, that is, in the natural greenhouse effect. He also studies the diffusion of light by large molecules and dust, known as the Tyndall effect, and he performs experiments demonstrating that the sky’s blue color results from the scattering of the Sun’s rays by molecules in the atmosphere.

Tyndall is passionate and sensitive, quick to feel personal slights and to defend underdogs. Physically tough, he is a daring mountaineer. His greatest fame comes from his activities as an advocate and interpreter of science. In collaboration with his scientific friends in the small, private X Club, he urges greater recognition of both the intellectual authority and practical benefits of science.

Tyndall is accused of materialism and atheism after his presidential address at the 1874 meeting of the British Association for the Advancement of Science, when he claims that cosmological theory belongs to science rather than theology and that matter has the power within itself to produce life. In the ensuing notoriety over this “Belfast Address,” his allusions to the limitations of science and to mysteries beyond human understanding are overlooked. He engages in a number of other controversies such as spontaneous generation, the efficacy of prayer and Home Rule for Ireland.

In his last years Tyndall often takes chloral hydrate to treat his insomnia. When bedridden and ailing, he dies from an accidental overdose of this drug on December 4, 1893 at the age of 73 and was buried at Haslemere, Surrey, England.

Tyndall is commemorated by a memorial, the Tyndalldenkmal, erected at an elevation of 7,680 ft. on the mountain slopes above the village of Belalp, where he had his holiday home, and in sight of the Aletsch Glacier, which he had studied.

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Birth of Robert McCarrison, Physician & Nutritionist

robert-mccarrisonMajor General Sir Robert McCarrison, physician and nutritionist in the Indian Medical Service, is born in Portadown, County Armagh in what is now Northern Ireland on March 15, 1878.

McCarrison is credited with being the first to experimentally demonstrate the effect of deficient dietaries upon animal tissues and organs. He also carries out human experiments aimed at identifying the cause of goitre, and includes himself as one of the experimental subjects. Much of his work is pioneering. His 1921 book Studies in Deficiency Disease is considered notable at the time, being published at a time when knowledge of vitamins and their role in nutrition is crystallizing.

McCarrison qualifies in Medicine at Queen’s College, Belfast in 1900. At age 23, he goes to India, where he spends 30 years on nutritional problems. His research in India on the cause of goitre wins widespread recognition and in 1913 he is promoted to do research. He attains the rank of major-general in the Indian Medical Service and founds the Nutritional Research Laboratories in Coonoor, where he remains until his retirement from the Indian Medical Service in 1935. After retiring, he returns to England and gives a series of three Cantor lectures on successive Mondays at the Royal Society of Arts, about the influence of diet on health. The first lecture focuses on the processes of nutrition; the second, on food essentials and their relationship to bodily structure and function; the third on disease prevention and physique improvement by attention to diet. The lectures are subsequently published in book form under the title Nutrition and Health, and at the time of the third edition in 1962, are still seen as relevant, with the advances of the preceding 25 years largely filling the details of the principles previously recognised by McCarrison.

McCarrison is made a Companion of the Order of the Indian Empire (CIE) in 1923, receives a knighthood in July 1933, and is appointed as Honourable Physician to the King in 1935.

After World War II, from 1945 to 1955, McCarrison serves as director of postgraduate medical education at the University of Oxford. He dies on May 18, 1960.

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Birth of James Thomson, Engineer & Physicist

james-thomsonJames Thomson, engineer and physicist whose reputation is substantial though overshadowed by that of his younger brother William Thomson (Lord Kelvin), is born in Belfast on February 16, 1822.

Thomson spends much of his youth in Glasgow. His father James is professor of mathematics at the University of Glasgow from 1832 onward. He attends Glasgow University from a young age and graduates in 1839 with high honors in his late teens. After graduation, he serves brief apprenticeships with practical engineers in several domains. He then gives a considerable amount of his time to theoretical and mathematical engineering studies, often in collaboration with his brother, during his twenties in Glasgow. In his late twenties he enters into private practice as a professional engineer with special expertise in water transport. In 1855, he is appointed professor of civil engineering at Queen’s University Belfast. He remains there until 1873, when he accepts the Regius professorship of Civil Engineering and Mechanics at the University of Glasgow in which he is successor to the influential William Rankine. He serves in this position until he resigns with failing eyesight in 1889.

In 1875 Thomson is elected a Fellow of the Royal Society of Edinburgh. His proposers are his younger brother William, Peter Guthrie Tait, Alexander Crum Brown and John Hutton Balfour. He is elected a Fellow of the Royal Society of London in June 1877. He serves as President of the Institution of Engineers and Shipbuilders in Scotland from 1884 to 1886.

Thomson dies of cholera in Glasgow on May 8, 1892. He is buried on the northern slopes of the Glasgow Necropolis overlooking Glasgow Cathedral. One obituary describes Thomson as “a man of singular purity of mind and simplicity of character,” whose “gentle kindness and unfailing courtesy will be long remembered.”

Thomson is known for his work on the improvement of water wheels, water pumps and turbines. He is also known for his innovations in the analysis of regelation, i.e., the effect of pressure on the freezing point of water, and his studies in glaciology including glacial motion, where he extends the work of James David Forbes. He studies the experimental work of his colleague Thomas Andrews concerning the continuity of the liquid and gaseous states of matter, and strengthens understanding of it by applying his strong knowledge of thermodynamics. He derives a simplified form of the Clapeyron equation for the solid-liquid phase boundary. He proposes the term triple point to describe the conditions for which solid, liquid and vapour states are all in equilibrium.

Thomson also makes contributions in the realm of fluid dynamics of rivers. It is claimed that the term torque is introduced into English scientific literature by Thomson in 1884.

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Birth of Samuel Haughton, Scientist, Mathematician & Doctor

samuel-haughtonSamuel Haughton, scientist, mathematician, and doctor, is born in Carlow, County Carlow on December 21, 1821. He is “famous” for calculating the drop required to kill a hanged man instantly.

Haughton is the son of James Haughton. His father, the son of a Quaker, but himself a Unitarian, is an active philanthropist, a strong supporter of Father Theobald Mathew, a vegetarian, and an anti-slavery worker and writer.

Haughton has a distinguished career at Trinity College, Dublin and in 1844 he is elected a fellow. Working on mathematical models under James MacCullagh, he is awarded in 1848 the Cunningham Medal by the Royal Irish Academy. In 1847 he has his ordination to the priesthood but he is not someone who preaches. He is appointed as professor of geology at Trinity College in 1851 and holds the position for thirty years. He begins to study medicine in 1859. He earns his MD degree in 1862 from the University of Dublin.

Haughton becomes registrar of the Medical School. He focuses on improving the status of the school and representing the university on the General Medical Council from 1878 to 1896. In 1858 he is elected fellow of the Royal Society. He gains honorary degrees from Oxford, Cambridge and Edinburgh. At Trinity College Dublin he moves the first-ever motion at the Academic Council to admit women to the University on March 10, 1880. Through his work as Professor of Geology and his involvement with the Royal Zoological Society, he has witnessed the enthusiasm and contribution of women in the natural sciences. Although thwarted by opponents on the Council he continues to campaign for the admission of women to TCD until his death in 1897. It is 1902 before his motion is finally passed, five years after his death.

In 1866, Haughton develops the original equations for hanging as a humane method of execution, whereby the neck is broken at the time of the drop, so that the condemned person does not slowly strangle to death. “On hanging considered from a Mechanical and Physiological point of view” is published in the London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Vol. 32 No. 213 (July 1866), calling for a drop energy of 2,240 ft-lbs. From 1886 to 1888, he serves as a member of the Capital Sentences Committee, the report of which suggests an Official Table of Drops based on 1,260 ft-lbs of energy.

Haughton writes papers on many subjects for journals in London and Dublin. His topics include the laws of equilibrium, the motion of solid and fluid bodies, sun-heat, radiation, climates and tides. His papers cover the granites of Leinster and Donegal and the cleavage and joint-planes of the Old Red Sandstone of Waterford.

Haughton is president of the Royal Irish Academy from 1886 to 1891, and secretary of the Royal Zoological Society of Ireland for twenty years. In 1880 he gives the Croonian Lecture on animal mechanics to the Royal Society.

Haughton is also involved in the Dublin and Kingstown Railway company, in which he looks after the building of the first locomotives. It is the first railway company in the world to build its own locomotives.

Samuel Haughton dies on October 31, 1897 and is buried in the Church of the Holy Cross Cemetery in Killeshin, County Laois.

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Birth of John Kyan, Inventor in Wood Preservation

kyans-patentJohn Howard Kyan, inventor of the ‘kyanising’ process for preserving wood, is born on November 27, 1774 in Dublin. His father, also John Howard Kyan, is the owner of valuable copper mines in County Wicklow. He is educated to take part in the management of the mines, but soon after he enters the company its fortunes decline, and in 1804 his father dies almost penniless.

For a time Kyan is employed at some vinegar works at Newcastle upon Tyne, but subsequently removes to London. The decay of the timber supports in his father’s copper mines had already directed his attention to the question of preserving wood, and as early as 1812 he begins experiments with a view to discovering a method of preventing the decay. Eventually he finds that bichloride of mercury or corrosive sublimate, as it is commonly called, gives the best results and, without revealing the nature of the process, he submits a block of oak impregnated with the substance to the Admiralty in 1828. It is placed in the ‘fungus pit’ at Woolwich, where it remains for three years exposed to all the conditions favourable to decay. When taken out in 1831, it is found to be perfectly sound, and after further trials it still remains unaffected.

Kyan patents his discovery in 1832 (Nos. 8263 and 6309), extending the application of the invention to the preservation of paper, canvas, cloth, cordage, etc. A further patent is granted in 1836 (No. 7001).

The process attracts great attention. Michael Faraday chooses it as the subject of his inaugural lecture at the Royal Institution on February 22, 1833, on his appointment as Fullerian professor of chemistry. Dr. George Birkbeck gives a lecture upon it at the Royal Society of Arts on December 9, 1834, and in 1835 the Admiralty publishes the report of a committee appointed by the board to inquire into the value of the new method.

In 1836, Kyan sells his rights to the Anti-Dry Rot Company, an Act of Parliament being passed which authorises the raising of a capital of £250,000. Tanks are constructed at Grosvenor Basin, Pimlico, at the Grand Surrey Canal Dock, Rotherhide, and at the City Road Basin.

Among the early applications of the process is the kyanising of the palings around the Inner Circle, Regent’s Park, which is carried out in 1835 as an advertisement with small brass plates being attached to the palings at intervals stating that the wood has been submitted to the new process. The plates soon disappear, but the original palings still remain in good condition.

The timber used in building the Oxford and Cambridge Club, British Museum, Royal College of Surgeons, Westminster Bridewell, the new roof of the Temple Church, and the Ramsgate harbour works is also prepared by Kyan’s process. When wooden railway ties become general, a very profitable business for Kyan’s company is anticipated, and for a time these hopes are realised.

It becomes evident that iron fastenings cannot be used in wood treated with corrosive sublimate, on account of the corrosive action, and it is said that the wood becomes brittle. The salt is somewhat expensive and Sir William Burnett‘s method of preserving timber by zinc chloride, and afterwards the application of creosote for that purpose, proves severe competitors. Doubts begin to be expressed as to the real efficiency of kyanising, and the process gradually ceases to be employed.

John Kyan dies on January 5, 1850 in New York City, where he is engaged on a plan for filtering the water supplied to that city by the Croton Aqueduct.

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Birth of Physicist Ernest Thomas Sinton Walton

ernest-waltonErnest Thomas Sinton Walton, Irish physicist, is born in Abbeyside, Dungarvan, County Waterford on October 6, 1903. He is the corecipient, with Sir John Douglas Cockcroft of England, of the 1951 Nobel Prize in Physics for the development of the first nuclear particle accelerator, known as the Cockcroft-Walton generator.

Walton is the son of a Methodist minister, Rev John Walton (1874–1936), and Anna Sinton (1874–1906). In those days a general clergyman’s family moves once every three years, and this practice carries him and his family, while he is a small child, to Rathkeale, County Limerick, where his mother dies, and to County Monaghan. He attends day schools in counties Down and Tyrone, and at Wesley College in Dublin before becoming a boarder at Methodist College Belfast in 1915, where he excels in science and mathematics. He obtains degrees in mathematics and experimental science from Trinity College Dublin in 1926.

Walton goes to Trinity College, Cambridge in 1927 where he works with Cockcroft in the Cavendish Laboratory under Ernest Rutherford until 1934. In 1928 he attempts two methods of high-energy particle acceleration. Both fail, mainly because the available power sources could not generate the necessary energies, but his methods are later developed and used in the betatron and the linear particle accelerator. In 1929 Cockcroft and Walton devise an accelerator that generates large numbers of particles at lower energies. With this device in 1932 they disintegrate lithium nuclei with protons, the first artificial nuclear reaction not utilizing radioactive substances and so becomes the first person in history to split the atom.

After gaining his Ph.D. at Cambridge, Walton returns to Trinity College, Dublin, in 1934, where he remains as a fellow for the next 40 years and a fellow emeritus thereafter. He is Erasmus Smith Professor of Natural and Experimental Philosophy from 1946 to 1974 and chairman of the School of Cosmic Physics at the Dublin Institute for Advanced Studies after 1952.

Although he retires from Trinity College Dublin in 1974, he retains his association with the Physics Department at Trinity up to his final illness. His is a familiar face in the tea-room. Shortly before his death he marks his lifelong devotion to Trinity by presenting his Nobel medal and citation to the college. Ernest Walton dies at the age of 91 in Belfast on June 25, 1995. He is buried in Deans Grange Cemetery in Dublin.

(Pictured: Ernest T.S. Walton, 1951, by Nobel foundation)

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Birth of Henry Dixon, Biologist & Professor

Generated by IIPImageHenry Horatio Dixon, plant biologist and professor at Trinity College, Dublin, is born in Dublin on May 19, 1869. Along with John Joly, he puts forward the cohesion-tension theory of water and mineral movement in plants.

Dixon is the youngest of the seven sons of George Dixon, a soap manufacturer, and Rebecca (née Yeates) Dixon. He is educated at Rathmines School and Trinity College, Dublin. In 1894, after studying in Bonn, Germany, he is appointed assistant and later full Professor of Botany at Trinity. In 1906 he becomes Director of the Botanic gardens and in 1910 of the Herbarium also. He has a close working relationship with physicist John Joly and together they develop the cohesion theory of the ascent of sap.

Dixon’s early research includes work on the cytology of chromosomes and first mitosis in certain plants. Familiarity with work on transpiration and on the tensile strength of columns of sulfuric acid and water leads Dixon and Joly to experiment on transpiration. “On the Ascent of Sap” (1894) presents the hypothesis that the sap or water in the vessels of a woody plant ascends by virtue of its power of resisting tensile stress and its capacity to remain cohesive under the stress of great differences of pressure. Dixon and Joly further demonstrate that water is transported through passive vessels and not living cells.

Dixon writes Transpiration and the Ascent of Sap in Plants (1914), which brings various theories and experimental works together in a coherent argument. He also writes a textbook, Practical Plant Biology (1922).

In 1907 Dixon marries Dorothea Mary, daughter of Sir John H. Franks, with whom he raises three sons. He is the father of biochemist Hal Dixon and grandfather of Adrian Dixon and Joly Dixon.

In 1908 Dixon is elected a Fellow of the Royal Society. In 1916 he is awarded the Boyle Medal of the Royal Dublin Society. He delivers the society’s Croonian Lecture in 1937.

Henry Dixon dies in Dublin on December 20, 1953.

(Pictured: Henry Horatio Dixon, bromide print by Walter Stoneman, 1922, National Portrait Gallery, London)

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Birth of Sir Hans Sloane, Physician & Naturalist

Generated by IIPImageSir Hans Sloane, Irish physician and naturalist whose collection of books, manuscripts, and curiosities form the basis for the British Museum in London, is born on April 16, 1660 in Killyleagh, County Down in what is now Northern Ireland.

As a child Sloane possesses a strong curiosity of nature, and he develops a particular interest in plants. After studying medicine in London, he travels in France, taking an M.D. degree at the University of Orange in 1683. In 1685 he returns to London and is elected a fellow of the Royal Society. He proceeds to practice medicine as an assistant to British physician Thomas Sydenham. He is made a fellow of the Royal College of Physicians in 1687. That same year he accepts an opportunity to visit Jamaica, traveling as personal physician to the Christopher Monck, 2nd Duke of Albermarle, who had been appointed to govern the island.

The journey to Jamaica provides Sloane with the chance to pursue his interest in the natural sciences. During the 15 months of his travels, he visits multiple islands in the West Indies, including Saint Kitts, Nevis, and Barbados. He ultimately collects specimens of about 800 plants. He also records information on and collects specimens of various fish, mollusks, and insects, and he observes the local peoples and contemplates the natural phenomena of the area. His observations and the specimens he collects during the voyage lay the foundation for his later contributions to botany and zoology and for his role in the formation of the British Museum. He returns to England in 1689, his trip having been cut short by Monck’s death. His collection of plants from the West Indies is one of the first from that region to reach England.

Sloane’s trip to Jamaica also leads to his invention of a milk chocolate beverage. While on the island, he encounters a local drink made from a cacao plant. The beverage apparently makes him nauseous. To avoid this, he decides to mix the cacao material with milk. He finds this concoction to be not only more tolerable but also tasty and healthy. Shortly after his return to England, his milk-based concoction is sold by apothecaries as a medicinal product. His recipe later forms the basis for a milk chocolate product manufactured by Cadbury.

In 1696 Sloane publishes in Latin an elaborate catalogue, Catalogus Plantarum Quae in Insula Jamaica, on the plants he collected in Jamaica. He later publishes Natural History of Jamaica (2 Vol., 1707 and 1725), a comprehensive account of his studies of the natural phenomena of the island country.

Sloane also makes important contributions to medicine. He is physician to Queen Anne, King George I, and King George II. He is created a baronet in 1716, becoming the first medical practitioner to receive a hereditary title. He is relatively progressive as a physician, and, while serving George I, he adopts the practice of inoculation against smallpox for members of the royal family. In 1719 he is elected president of the Royal College of Physicians, a post he serves until 1735. In 1727 he becomes president of the Royal Society, succeeding physicist and mathematician Sir Isaac Newton. He holds the position until 1741. He earns a reputation as a specialist in eye diseases, and he eventually publishes Account of a Medicine for Soreness, Weakness and Other Distempers of the Eyes (1745).

Sloane is also known as an avid collector, and he benefits greatly from the acquisition of the cabinets of other collectors, including amateur scientist William Charleton and English apothecary and botanist James Petiver. When he retires from active work in 1741, his library and cabinet of curiosities has grown to be of unique value, and on his death he bequeaths his collection to the nation, on condition that parliament pay his executors £20,000. The bequest is accepted and goes to form the collection opened to the public as the British Museum in 1759.

Sloane has no son that survives beyond infancy, and the baronetcy becomes extinct upon his death in London on January 11, 1753.

(From: Encyclopaedia Britannica,