CHKMK'AL I'.ASIS OF TIIK ANIMAL j;nl>Y. 



:1 intrivst. The iihy>iul. i^i.-al function <,f any .-nk-tam 

 must depend ultimately on its molecular including it- chemical 

 natiuv ; and though at ).re-ent our chemical knowledge of the 

 c..n-tituents of an animal hody ^ives u- luit little insight into 

 their physiological properties. it cannot \- duil.t-d that such 

 chemical int'orniation as is attainable is a n<-r,-^,,iv preliminary 

 to all physiological study. 



These form the principal solids of the mu-cular. nervous. ami 

 ulandular tissue-. of the scrum of Mood, of si-rous lluids, and of 

 lyinjih. In a healthy c-ondition, sweat, tears. Idle, and urine con- 

 tain mere traces, if any, of ]>roteids. Tlieir general j.eiventa-e 

 eom]iosition may lie taken as lyini; within the following limits: 



C 50-0 to 55-0 ........... 50-0 to :,:,-( i 



H 6-9 7* ........... 6-8 7-3 



N 15-0 18-0 ............ 15-4 is-ii 



( L'li-u .. L':5-r ........... ^2-8 24-1 



S (I-: 1 . .. 2-0 ........... 0-4 5-0 



1 1 "1 '1 ie-Seyler. 2 ) (Drechsel.) 



The ei.m],n>itj.iii of the true ]iroteids lies go onstaiitlv within 

 the ahove limits that conclusions as to the jnoteid nature nf any 

 Milistance whose juirity is assui-ed may lie drawn with -at'ety from 

 the re-nit-- of it^ ultimate analysis. This is important in 

 where a suli-tance i> with ditlieulty. if at all, oUaincd in a < \\- 

 dition such that it yields mme of the reactions characteristic <if 

 jiMteid-. Kidine and < 'hittenden's analy-e- :: .,f j.eptones 

 from alluimoses. which they quote with considerali]. 

 alone -how a jiei-eenta-e comj,n>iti.in lyin^ aj.precialily out -ide 

 the aliove limit-. 



In addition t. tin- alive c.in-t it in-nt-, jimli-ids nnliniirily l-a\.-.ni 

 lUiiitinn a variable ([iiantity "I" a-h. In tin- rase nf r^-allmniiii flu- 

 |irinci|ial .-mi-t it iient- \ tin- a-li an- fldnrido !' -i'<liinii and 

 sjiiin. tlie latt.T c\cei'din u r tlie f<>nmr in aiimunt. Tin- r- iiiain<l<-r 

 ci.ii-i-t- ..f -ndiiini and |>nla--iiiin, in -.inliiiiat imi with phosphoric, 

 siil|ilinric, and carlmnic aciil-, and \.T\ -mall ipiant it ii- (' . alfiuin, 

 iiia^iii--iiini. and imn, in iininii \\itli tin- -aine acid-. 'I'licn- may !" 

 alx. a trare ..|' -ilica. 4 Tin- a-li "f M finii-allniiiiiii cnntain- an 



1 Tin- i-licini-try .>f [.r..t-ii|s and :illi.-.l -ii'.-iaii. . . t..^.-i ! 

 lit. r;iiiirc .if tin- vulijr. i, i~ \i-r\ full\ II-. iii-. I .iii'l rrrorili'i! in I' 



ill j,:uli hlniri:'- II, a, In;, ', >,,,! \\,\ ill II- 



illiil ill Hrilsti-in 1 -; llunill'url, H'l III (IHK^ -' 



- l/,IMl. ,1. /./-v.v ;,.,//, 



< (Jnirlin. //./'/. ./. ' Bdrni 8 205. 



