"He indicated each simple substance or element by the initial letter (or, where more than one had the same initial, by two letters) of its Latin or Greek name. In the case of compound bodies he added a small subscript figure to show the number of atoms of each element present in the compound when these atoms exceeded unity. Thus:— Oxygen was represented by the letter O. Hydrogen was represented by the letter H. Mercury was represented by the letters Hg (Hydrargyrum). Lead was represented by the letters Pb (Plumbum). Water, a compound of two atoms of hydrogen and one of oxygen, was represented by H2O. Litharge, a compound of one atom each of lead and oxygen, was represented by PbO."
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A History of Chemistry from the Earliest Times
A History of Chemistry from the Earliest Times (1920) was originally published as A History of Chemistry from the Earliest Times till the Present Day (1913). It is a work by chemist and professor , who taught at the Liverpool Royal Infirmary School of Medicine, . He is best known for this history of chemistry. The work was completed, post-mortem, from the notes used by Professor Brown to deliver his lectures on the History of Chemistry. Those notes were consolidated and edited by Henry H. Brown,
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