Carpenter's principles of human physiology . tained by boiling horn shavings or any form of albumen withstrong sulphuric acid. The fluid is diluted andneutralized with milk of lime, and filtered fromthe gypsum. It is then evaporated, acidified withsulphuric acid, and filtered. White lead is thenrubbed up with the filtrate, and a soluble tyrosin-lead is formed. The lead is precipitated withhydrogen sulphide, and the remaining fluid evapo-rated till the tyrosin crystallizes out. About oneper cent, of tyrosin can be obtained from Ov-albumin and muscle fibrin, and about two percent, from blood fib
Carpenter's principles of human physiology . tained by boiling horn shavings or any form of albumen withstrong sulphuric acid. The fluid is diluted andneutralized with milk of lime, and filtered fromthe gypsum. It is then evaporated, acidified withsulphuric acid, and filtered. White lead is thenrubbed up with the filtrate, and a soluble tyrosin-lead is formed. The lead is precipitated withhydrogen sulphide, and the remaining fluid evapo-rated till the tyrosin crystallizes out. About oneper cent, of tyrosin can be obtained from Ov-albumin and muscle fibrin, and about two percent, from blood fibrin. It is contained indecaying cheese, from which it may be abstractedby water, and purified in the way above is said to be found in the spleen andpancreas, and in acute atrophy of the liver in that ~5^gland, in the brain, and in the urine ; but it is tf==?^probable, from Eadziejewskys researches,* that Tyr°S1 it never occurs in any organ in a normal condition, with the single exception* Vircliows Archiv, 1866, May. Fig. 76 CHEMICAL COMPOSITION OF THE EODY. of the contents of the small intestines, where it results from the decompo-sition of albuminous compounds under the influence of the pancreatic with concentrated sulphuric acid it forms Tyrosin-sulphuric acidtogether with other acids. The former gives a beautiful violet colour, withiron and its salts (Pirias test). Tyrosin, like Leucin, is to be regarded asa product of the disintegration of the albuminous compounds. Indol, C8H?N.—This substance is produced in a quantity amounting to^ per cent, by digesting serum-albumin or egg-albumin with pancreatic juice. Itcrystallizes from hot water in large shining colourless laminee, resemblingbenzoic acid, but with a peculiarly nauseous smell. It melts at 52° C; boilswith partial decomposition at about 245° C.; volatilizes in a vacuum withoutdecomposition, and distils easily with vapour of water. It is a weak base, itssalts being decomposed by boi
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
