The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . essity of an electric -i<ark;it moreover possesses a great advantage over this latter modeof combustion, as it enables these gases to unite, howeversmall the proportion of hydrogen may be, whereas the elec-tric spark will not fire a mixture in which the oxygen is inconsiderable excess. In performing this experiment we haveonly to mix the hydrogen gas with the ai
The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . essity of an electric -i<ark;it moreover possesses a great advantage over this latter modeof combustion, as it enables these gases to unite, howeversmall the proportion of hydrogen may be, whereas the elec-tric spark will not fire a mixture in which the oxygen is inconsiderable excess. In performing this experiment we haveonly to mix the hydrogen gas with the air to be examined,in the proportions above directed, and then to introduce intothe jar a pellet composed of the spongy platinum, and allowthem to remain in contact. Scheele in his eudiometricalresearches, employed liquid Sulpkurct of Potass, a substancewhich possesses the property of absorbing oxygen, but notazote. It therefore acts on atmospheric air, only as long asany oxygen gas remains, and may be employed as the meansof ascertaining the quantity of this gas in any portion of applying this test, Dr. Hope of Edinburgh invented aninstrument, which is represented in the margin.(R) It con- PABISS MEDICAL CHEMISTRV 253. into the bottle. sists of a small bottle, holding about threeounces, into which the graduated glasstube a is carefully fitted by grinding. Italso has a ground stopper at b. To use it,the phial is filled with the solution, andthe tube a, containing the air to be ex-amined, fitted into its place. On invertingthe instrument, the gas ascends into thebottle, where it is to be brought extensive-ly into contact with the liquid by briskagitation ;—an absorption ensues ; and toJ supply its place, the stopper 6 is openedunder water, a quantity of which rushesThe stopper is replaced under water : theagitation repeated ; and these operations are renewed alternate-ly, till no farther diminution takes place. The tube a is thenwithdrawn, the neck of the bottle being un
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Keywords: ., bookcentury1800, booksubjectchemistrypharmaceutica, bookyear1825
