(INIMICAL I'.ASIS n|- Till: ANIMAL 



Lin<l\vall ('r>f. <-,t.) d>-*i-rileil tin- format i-m "f an all.iimiiiatr an<l :i 



.' album".-!-) .-ub-taiire during tin- t n-atnu-iit ! k> 

 with <lilnt- (1 - p.*'.) run-tic -da at digestion temperatures. 



Neurokeratin. 1 



Whi-ii tli-- -ubstunce of the I'rain or any ma-s of inedullated 



a is thoroughly extracted with water, alcohol. and ether. ami 



then di^e-ted with jK-jisin and tryp-in in succession, a residue is 



obtained which cloaelj leflemblea tin- ordinary keratins, and con- 



stitutes alout I"- ll" l'.' . of the wholi- 1-; i it ha- 



Q it> medullary constituents l>y alcohol and rthrr- This 



nt-urokfi-atin, so nann-d from th, irom which it 



is obtained. It i- characterised l.y its somewhat greater resistance 



to those decomposing ; io,. n t< who-,.- action on keratin ha- been 



iv described. The determination --t it- udotenoe in tissues 



which are not oliviou>ly epidermal in the adult is of ..n-nlerahl> 



vological and morphological interest, since it throws some 



light upon the developmental origin of the structures in which it 



M-nt or absent.- 



Although it i- not found a- a constituent of any mammalian 



tissue, this substance eom)N.<ex the ( hief part <>f the exoskelet-.n 



rtebrates. It is hy man\ d as the animal 



"^ue of cellulose of plants, and from this point of view it 



possesses considerable morphological interest The m<>*\ < \\- 



ni which it may l.e j-iepaied i> the . l.-an-ed 



>.s or lolisterv Thi> i- tir>t thoroughly e\ti 



with dilute hydr.M-hloiic a. id and caustic p .-r which it is 



dcohol and ether, and may l.e tinalh 

 : l.y the action of j.ei inanimate of j.otasli. 5 It 

 .liite aiiiiirphoii- -ul.stance. which oft.-n retain- the -!i.i] of 

 iimeiit from which it ha- l.een pn- pa ret I. It i- m-olul.le 

 her than concentrated min- i >n- h as 



Milpi hydi'K hlc.ii. The immediate adiliti' 



..l.al.ly reprecipitate- the chitin in an uualUJred 



\Vhell heated \S 1th c,.||C.-ntlate,l hvdl'N hl"ll'- acid it is 



:ito -ly. o-amin and .1 I which the i 



.il.l. Vtihattd. n,tt*rhitt..t*l I ||. ... P. i I I- 

 Kulr ll"J- M ^Xl (I 1 *'"'). - s ttL 



KM 

 * t ^teinbrfigK^ II- 



XM 



,.A v .o/ rkfm.JU ii (l> Hot Me abo 8ai. 



lb<d i 



H. /'A .,W Jhr. ir, 2 



ll,U*k ,i. /av.iW-/., i -. Aafl. I8SS, 8. 188. 

 Knik 



