CHEMICAL BASIS OF THE ANIMAL 1;<>1>Y. 



liy pepsin ami try].siii. and is in fad indi-tin^ui-hable from all 

 other coagulated pn.teids. 



A peculiar property >f this body remain- yet to l.e in.-uti< 

 vix. itsjiower of decomposing hydrogen dinxid"- !': 68 of fibrin 

 placed in this lluid, though themselves underiMiinj,' m> change. 



-..on become covered with bubble- i.f oxy-.-ll ; alld ^Uaiacllll 



turned 1'lue by tibriu in pie-ence .,f h\dr--eu dioxid- 

 turpentine. 



When globulin, niyosin. and tilirin are compared each with the 

 other, it will l.e -ecu that they form a series in which nn|os_mi- 

 ijjU-rmcdiate between ^lobnjm and tihriu. (Ilobulin is e\e. -s-ivelv 

 s^lubleiii even tlie most dilute acids and jdkajjs ; tibrin is aln 

 insoluble in these ; while myosin, though m ( re soluble thai i 

 fibrin, is less soluble than globulin. (ilobulin a>aimILi^oJ\ex 

 wjth__the^ greatest ease in a very clihija^solution of sodium chlo- 

 ^'T^MvosiiL on the other hand, dissolve's with dijliculty ; it is 

 much more soluble in a 10 per cent, than in a one per cent. -<.lu- 

 tinii iif sodium chloride ; and even in a 10 per cent solution the 

 myo>in can hardly be said to be di>snlved. -<. viscid is the ie>ult- 

 inu lluid and with such difficulty does it filter. Fibrin aj;ain 

 dissolves with ^rcat ditliculty ami very slowly in even a 10 per 

 cent. >oluti'"''n of sodium chloi-ide. and ni a one ]M-I- cent, solution 

 it is practically insoluble "VYTien it is remembered that tibrin 

 and myosin are. both of them, the results of clotting, their simi- 

 larity is intelligible. Myosin is in fact a somewhat more soluble 

 form of tibrin, deposited not in thread- or filament- but in clumps 

 and ma- 



<'i.\-s \". ( ',,<i>inlnted Proteids. 



Tr J 



These are insoluble in watei\ dilute ac^tls and alkalis, and 



SfllJllV SobiH'r>m of nil <ttr'iiirtbs In fact they ale really 



luble o^nly in strong acids and strong alkalis, though j.n.loi: 

 action of even dilute acids and alkalis will died >..me solution. 

 especially at hi-h tcmpciat UL-. ljurinu solution in stnniu acjds 

 destructive decomposition takes place, but some 

 ajiionnt ui acid- or alkali-allmmin is always produced, together 

 with some jteptonu and allied snb 



Very little i- known of the chemi< ten-tic- ..f this 



class. TJ.ey are produced by huatinir to 100 (-'. solut 



siTiiiii-iilbmiiin H^MJli* iis|iniftl in \\ntfr nr dissolved in 



lino qf >1iiti..i.s b\ h..ilin tori -h"rt time tibrin -iisjM-nded in 

 water, or preci].itate<l acid- and alkali-albumin -u-jH-uiled in 



ter. They are readily converted at the t-nn>erature of the 

 body into ]*-].toncs. bv the action of uastru mice in an acjd. or of 



iHTe:i|jc j^ce j|f :m alkaline medium. 



All proteids in solutinn are precipitated bv an eyes. ,,f v. 

 . If the precipitant be rapidly removed th- 



