( IIKMICAL BASIS OF THK AM.MM. BODY. 



thin slices, washed with distilled water and extra, ted with half- 

 saturat'-d liuu--w.it.-r , the mucin is thus di-sol\vd. and is purified 

 by prei ipitation with cither acetic or hydrochloric acids, re-solu- 

 tion in dilut-- alkali, and repie.-ipitation with ;K'U\<. In ii 



.us it resembles tin- nuicins previously described, hut appears 

 GTer from them in its distinctly ;.'!. HPT to the .; 



,ind alkalis. 



in of the umbilical cord. 1 May be extia< t.-d by means of 



i and is readily precipitated from tin- solution 1 acid. 



ra to differ from thi- other nnu-ins in containing more 



tnd a considerable amount of sulphur: it lie- i: 

 .vhat midway between the proteids and true niucin-. 



d boilini: \\ith -ulphurie acid nuicins yield leucin 

 and t\i'-.in, but the pr.Hlucts of their decomposition have not been 

 t fully stud: 



ial mucins exhibit differences in percentage 



composition which lie within somewhat similar limits t" those al- 

 ready assigned (p. 5) to the proteids. A comparison of these seems to 

 v the statement that on the whole the mucins contain slightly 

 M and distinctly less nitrogen than do the prot 



i "'searches <n nmciii L:nul\vi-)ir * .il>t;iiin-d a xil.-tance to 



\\hich li.- ^ave the name of "auiiiial-^uin " I'n-m its general >imil:ir- 



tlit- \t-^ftal'le products of tli<- >ann- name. II.- was at tir>t in- 



1 ti n-^ard the iimciii> as iiii\tiin-s <>f tliis carlmliydrati' with 



pp.t-il >ul'-tancrs. l>ut this view he .siil.sc.|iifiitly iiK.ditit-d. 4 



Kiirtlit-r invf-ti^atinii lias led him to regard aiiiinal-^iii. :rrin^ 



in many ti--iu-s of the \n\\. and tc. >|n-cnlate <>n its pliy>i"l"^ical and 



al significance. '' IN i>"lati"ii ficiiii tin- >.\.i;il ti-- 



.ind c.iinplicated. ami t"..r this I.amlucln 



:s must be consulted. It iliM>l\i-^ in \ .idily 



n^j Milutioii. fr'in wliich it iua\ i.itatid ly alc->li<'l. Ii, 



alkaline sulution it n-adily di--"l\'-^ cupric o\id- \vhicli luccd 



<>ii I..,ilinj4: \\li.-n l.oiled \\ith dilute mineral arid* it yi-Id> a p-ducin^ 



if iM.t altered l.y di^e-tinn \\ith -aliva -r 

 JIM.-.- (see also bel<>w under carl">liydratcs). 



It ha- I.een alp-ady -tat-il that puritied niucin (e\r.-pt ..f l.il.-) 

 yield- a .ai!...li\lrate \\li.-n li. at.-d with acid- or >t 



-ideraMe i-iui- ii d --ii .1- t" \\li' th. T .uiiliial- 



in the tissues M ft i 



li.- iimcins ..r whether it i- in all ra-e- their 



decomposition. The .-\idence at hand mi tin- jH.int iiclu- 



:,t it may \- -aid that, while iimcin i- 



-.1 (Swedish). See Abst. in Maly'n Btrirkl. 1880. 



8 :i 



. rmanti. H>ol. Cmlr,, 1887-88), > 



tiot. Ckem -HI), 8. 75; Till. (1883), S. 128. 



Ibi>l. IM IX. S 



( it ,,. (1885), S. 39. IflUger'c Arrk Bde. xxxti. (1686). 



