< m:\ncAi. BASIS OF itu: ANIMAL r.nu^. 



... CeUulose ( ( ll 



Although tiu- cellulose is never fciiii<l as a constituent of the 

 animal ti.-Mi.--.it possesses no inconsiderable interest fur tin- ph\-- 



-t in \i.-\\ .-I ill-- t'.i.-t tliat in the hcrhivora a lar^e amount 



: .iinl ,i: Q that It does nut iva; 



Mally in the excreta. In man also there i- n doul.t that 



-tii'ii and absorption of cellulose may occur, tin- pi 

 In-iii^ facilitated by tin- tact that in those more succulent \. 

 and fruits in which it is taken by man, the cell-wall 

 comparatively non-liu'nitied and hence more easily acted ii]mn bv 

 the dL'e-ti\e agents. 



Tin- li^niticati-.n ..f tin- ei-11-wull \\liirli has taken place in th.-.-e 



which tin- name '\\cn.dy' i> ordinarilv applied i- due 



, -uli-taiier called li^nin. \"-ry littl.- i> kii"\\n "f 



i cli.-inical indiviilual: it appears t.. c.nitain nmre rarlH.n than 



.-(llulii>e. [ts discrimination from oelluloM dapeadi <HI th< 



that it i- e..l"iin-il yi-ll..\\ l.y t In- act i..n ..f Seluil/.-'s n-:i^t-ut i --.- \ >,-},, \\ ) 

 and d.-t-p lrn\n l.\ that <! iodine and sulphuric nciil. \Vln-n t: 

 with pldi.p.^'liu-in an<l .-tmii;,' liydr"chl.>ric acid it turn- n-d : it is 

 4-nlniired hri^ht \t-ll.iu l.y the ;ictin .f aniline -ulphati- ..r i-)il<>rid<> 

 anil th. -id.-.-. |iirnt additii.n f hyilr'.clilric acid. 



l-'uith'-r. although ; ,t present but little is known as to how the 

 .-llulosu is brought about in the aliment. 



.dellCe of the pos.-ible e\i-ten<'c of a -] 



me t whose solvent action the change i- din-. I'.ut as yet 

 ta almost entirely upon exju-riineiits with and 



ilde organism-. 1 



--.1 to -tai.-h and iii -ome cases (Date, I'hyt.-le- 

 phas) pl.r. it of a Store < material, beiii'_' di-- 



.Miably b\ -..in.- en/yni'-. and utilised during ,uermin 

 i .-ll-wall of \.-ir,. table cell- is coni|K)sed of cellulose, which in 

 !1- i- pun- and muel. -i-tant t- jent- 



the ulder c.-H- \\1|. i .Hid 



-ted with oth.-r -ub-tan-e-. When pure it is soluble in OIL- 

 reagent only which is a solution of hy.i 



ii ammonia- Wh-n ti..it.-d \\ith -tmn^ sulphuric 

 -Ihilose is changed and yi.-ld- a -ub>tan'e which 18 col- 



observed on the addition 



\.l r MI (1890), p. 497. CooUiw 

 lire. 



pond a T l|.htof copper in flotation. t<> whk-h MIIM am mot 



fhl.iri.l. has U-rn a.l.l.-l. i- j.r--. ipiUUed with rstutir ud : the hjdrmtfd rnpn 

 I'taincd U wwihed, ami diMolved to Mtnntkn in SO p.c. mmrooi 

 - prepare! l.y ( . 



n of the copper being effected hr drawing current of air through the floid 

 in which the taming* are immerMd. (CroM and Bermn. Cr///ow, ISM. p. 6 ) 



