rilF.MK AI. l',A>IS OF TIIK ANIMAL BODY, 



mil network. The li>.-"hed |>urt~ lar^'-h i a Mihstaiu-i- (cluui- 



dlOiniieoid) With marked atHuiti*-* t<> inuciii. wherea> tin- tindi"lvrd 



rk. 1'V treatment with acids or sup-rh.-.r 

 largely into typical ^.-latin. For further detail- the original paper- 



ly quoted >h.>uld be o.n-ult.-.l. 



Elastin 



This is the characteristic component of tlie elastic fibres which 



the removal of gelatin, mm-in, fats, etc., from tissues 



such as liiMniiMituin iiurhae." Some of the more important 



in which it di tiers from the substances which have been )>n-\ ini<ly 



art- sutliri.Milly statrd l.y ili-xTil.in^ th,. m.-tli..*! \ it- 



preparatitin in a i>uiv form. 1 Li^''"tuin mn-hai- i an \ is cut 



intit tin'- -li--.--. tn-atrd t'c.r thn-c or fmir days with l.uiling water, 



tln-n tor -..in.- hours with 1 j i.e. caustic potash at 100C and >uU-- 



(ju-ntlv with wat-r Tlii- ]>r<ci->-* i- then n-jM-at.-d with 10 p.c. 



I Finally it is ti.-;,- _: \ hours in thf cold with 5 



wasln-d with water, boiled with '..". }>.r..alco- 



nd extracted for at least two w.M-ks with rther to remove 



of adln-ivnt fat. I'.y the alovc nn-thod it may l>e ob- 

 d as a pale ytdlowish |>owd-i in which th- shajx- of fragments 



of tin- original clastic fibres may be still distinguished under tin- 

 When uioi-t it i> yellow ami elastic, but on drying 



- Brittle and may with ditliculty lie j.ulveri-ed \\\ a raor- 

 Suljihur jiroliahly din-s m.t enter int.. it- composition ('). It 



. ed by >tl<>nu r alkalis at 100(.', and it also goes into 

 Dilution when treated with mineral acids at the same tem{nuure ; 

 1'iit in the latter case the solution involves decomposition with tin- 



much leucin (30 40 p.c.) and traces _'.". | 



tvrosin when the acid employed j> sulphuric.- I: -n-.n- li\ln>- 

 ehh.rii- acid be enijiloyed with chloride of xinc the same crystalline 

 1'tained together with ammonia. gljOOOOll, and an 

 ami. I id. l>ut ii" ^lutamic or aspartii- acids.-' 1 In this 



respert it diH'er- frm botli ordinary j.roteids and gelatin, -inc.- the 

 r when ximilarh tiv.n.-.l \ i.-ld the ojulamic and a-; 

 lyco. oil. and the latter never yield- tin- lea-t 



huflllU' the ptltlefactlVe dec.i||||Mi-.i(|on of .-l.l-till J'lo- 



-imilar t> the above are obtained to^.-thej with *\w |H-p 



like -llh-taiice Wild! tle.ited with -1lp-lhe.lt. -.1 

 with dilute hvdio, hlori. a. id at 1<HI (' .l with \p-lli 



1 ami alkaline medium re-.) 



and uiiiler^'oe- a tin VG . haiiu'.-. during 



'in--.! many \ \\ho- ' reactioim are 



'II f. pkvnol. <'>>H IM M (JHH^).S no ( !Mtt.-ii.l.-n an.l 



li M 



Wui. i.: I ; :i 



