Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . T. , of New Haven, Conn. ./. Tank into which freezing mixture is pumped and from which it flowsthrough the condenser, B ; C, flask from which the esters are distilled, the dis-tillate being collected in D ; E, a Dewar flask containing liquid air servingas a cooler for condensing tube F; G and G, tubes leading to the Geryckpump by which the vacuum is maintained : /, tube leading to a McLeod guage(not shown in figure) ; J, a bath containing
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . T. , of New Haven, Conn. ./. Tank into which freezing mixture is pumped and from which it flowsthrough the condenser, B ; C, flask from which the esters are distilled, the dis-tillate being collected in D ; E, a Dewar flask containing liquid air servingas a cooler for condensing tube F; G and G, tubes leading to the Geryckpump by which the vacuum is maintained : /, tube leading to a McLeod guage(not shown in figure) ; J, a bath containing freezing mixture in which thereceiver D is immersed ; K, a bath of water during the first part of the dis-tillation and of oil during the last part of the process ; 1-5. stop cocks whichpermit the cutting out of different parts of the apparatus as the proceduredemands. 68 PHYSIOLOGICAL CHEMISTRY. as an end-product of the decomposition of gelatin. Tyrosinand leucin have the power of forming salts with copper. Sincethe tyrosin salt is much less soluble than the leucin salt, thisforms the basis for a method of separating these bodies. Fig. Tyrosin. Tyrosin is found in old cheese, and derives its name fromthis fact. It crystallizes in tufts, sheaves or balls of fineneedles, which melt at 295 ° C. and are rather insoluble incold (1-2454) or boiling (1-154) water. It is soluble inalkalis, ammonia or mineral acids, and less easily soluble inacetic acid or hot 95 per cent alcohol. Tyrosin responds toMillons reaction, thus showing the presence of the hydroxy-phenyl group, but gives no other proteid test. In severe casesof typhoid fever and smallpox, in acute yellow atrophy of theliver, and in acute phosphorus poisoning, tyrosin has beenfound in the urine. Tyrosin crystals obtained as a decom-position product of the proteid gliadin are shown in Fig. 23,above. Leucin, C6H13N02.—Leucin is an important end-productof the decomposition of proteid material, and was the first ofthese pr
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