The London dispensatory, containing: I, the elements of pharmacy; II, the botanical description ... and medicinal properties, of the substances of the materia medica; III, the pharmaceutical preparations and compositions of the pharmacopoeias of the London, Edinburgh, and Dublin Colleges of Physicians / By Anthony Todd Thomson.

Anthony Todd Thomson

Date:: 1836

Credit: The London dispensatory, containing: I, the elements of pharmacy; II, the botanical description ... and medicinal properties, of the substances of the materia medica; III, the pharmaceutical preparations and compositions of the pharmacopoeias of the London, Edinburgh, and Dublin Colleges of Physicians / By Anthony Todd Thomson. Source: Wellcome Collection.

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mercury, it occupies 1800 times the space which it does in the form of water. It is not decomposed by heat alone; nor altered by light : but is decomposed by iron, zinc, antimony, and tin, when assisted by heat. It readily absorbs air and gases ', and is a constituent of all gases. It is a compound of oxygen and hydrogen, 100 gt ains containing 88°9 of oxygen, and 111 of hydrogen *: or its constitution may be thus stated : — By weight. By volume. OXYGEN ..ceccescerslasseversoeves 8=—l. 1 Hydrogen: sess} 2033. vecseeee LE], 2 Equivalent 9 , It liquefies a great number of solid bodies, its solvent power being increased by diminishing the pressure of the atmosphere ; and, as has been already stated, the greater number of liquids contain it as an ingredient. It is also present in some compounds, in fixed definite proportions, forming hydrates. Riseiplaareted hydrogen is a transparent viscid liquid when pure, of a greenish yellow colour. It has a strong peculiar odour, and a pungent yet cooling taste. Its specific gravity is 1°769. It burns like spirit of wine, and during the com- bustion emits a sulphurous odour. It is a compound of 96°75 parts of sulphur, and 3°25 of hydrogen; or two proportionals of sulphur = 32, and one proportional of hydrogen = 1; making the equivalent = 32:2. Bichloride of tin is a transparent liquid, which exhales a very heavy dense smoke when exposed to the air. ‘Twenty-two parts of it united with seven of water condense into a solid mass. It yields by evaporation small crystals, which are deliquescent, and sublime in a moderate heat. It con- sists of one proportional of tin =57:9, and two propor- tionals of chlorine =70°84; making the equivalent=128°74. Phosphuret of sulphur is of a yellowish white colour, has a crystallised appearance, and is exceedingly inflammable. Its components are 100 parts of sulphur, and 75 of phos- phorus. Sulphuret of carbon is a transparent colourless liquid, having an acrid, pungent, slightly aromatic taste, and a foetid odour: It is very inflammable, burning with a blue flame, and emitting fumes of sulphurous acid. It is a compound of 84°83 parts of sulphur, and 15°17 of carbon; or two pro- portionals of sulphur = $2°2, and one proportional of car- bon = 6712; making the equivalent = 38°32. 1 From Mr. Dalton’s experiments, it appears that water absorbs its own os of carbonic acid gas, of sulphureted hydrogen gas, and of nitrous oxide; 4, of oxygen gas, nitrous gas, and carbureted bydrogen ; ; and } of carbonic oxide, azotic gas, and hydrogen gas. 2 Biot and Arago. E 3

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