Tag: Joseph Priestley
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The periodic table of the elements
In this system hydrogen is assigned the number one, lithium is three, carbon six, nitrogen seven, oxygen eight, etc. The elements are organized in rows or periods and columns or groups according to their atomic weight. The elements were discovered beginning in the 18th century when the Swedish chemist Carl Wilhelm Scheele discovered oxygen (1772),…
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Physicians and photosynthesis
JMS Pearce Hull, England Fig 1. Portrait of J.B. van Helmont, 1683. Wellcome Collection. Public domain. The importance of plants in nutrition and in the environment of human and animal species needs no emphasis. How plants obtain their food and how they grow were unsolved mysteries until photosynthesis was discovered. It was generally believed…
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John Bostock and hay fever
JMS Pearce Hull, England Fig 1. Bostock’s paper to Medico-Chirurgical Transactions of London, 1819. Before the 1800s, hay fever, now estimated as affecting 5–10% of Western populations, was not widely recognized by physicians. James MacCulloch MD FRS, a doctor and geologist, in 1828 was the first to use the term hay fever, which he…
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The X Club
JMS Pearce Hull, England, United Kingdom Fig. 1 TH Huxley Wikipedia: This work is in the public domain Charles Babbage, who conceived the first automatic digital computer, published in 1830 Reflections on the Decline of Science in England. This stimulated the formation of several new groups that aimed to further scientific progress and exchange…