( HKMICAL BASIS OF T1IK ANIMAL I'.ODV. 



slight extent tin- power of slowly liydn.lysinx starch into maho-e . 

 tlii- conversion being more rapid if portion- ot tin- nun -i.il> mem- 

 brane of tin- intestine he tim-ly divided and immersed in the 

 .-tarch solution. 1 The tissue and its extracts, on tin- other hand. 

 possess to a very marked extent the power of rapidly ellerting * 

 conversion if maltose into dextrose ; tlr icat phy.-iol. 



significance, inasmuch as it points to the probability that the car- 

 bohydrate- an- absorbed from the intestine as dextro-e and not as 

 maltose, a view which is supported by the fact that maltose dot-- 

 not appear to be capable of direct assimilation, but is excreted 

 laivly unchanged if injected into the blood. 2 If this \te so, then 

 - dextrose that the liver receives its supply of carbohydrate 

 material for the formation of glyco^en. a fact which is of no 

 small inteiv.-t when we know that the liver discharges the carbo- 

 hydrate which results from the reconversion of -Jyco^en into 

 sugar a- dextro-e. 3 (See also suit glycogen.) 



( 'aiu---ULcar ha> been shown by Iernard t he similarly incapable <>f 

 a. imilatioii: if injected into the blood it is excreted in tin- urine 

 iinrhan^iMl. \\'lit-n taken through tin- alimentary canal it i- probably 

 inverted nr converted into a mixture <>f dextrose and la-\ul>e, \sliirh 

 are then a>-imilal>le. 



Tin- <-Mii\.-r-i.'ii nf hepatic glycop-n int .-u^ar a- a preliminary t it- 

 di-i'liar:4'- from the liver has more usually been regarded a- dependent 

 iipmi tlie aeth ity -f .-cnue ,-pei-ial hepat ie en/yine. Tin- \ie\\ i- n\\ 

 no longer tenable in face !' the ne^atne e\ idence a- \ it- t-xi-ten,-.- 

 olitained by moi-i- recent <.b-ei-\ .-r-. 4 (S.-.- al- >nb ^lye..^eii.) 



Pepsin. 



This is the characteri-tiy proteolytic ,^/.viiie of ^a.-tri<' juic.- 

 It was first separated out" in an approximately pure form by 



" 



Hi- method \\a- a- tolli\v>. Tin- miie-.n- membrane { the -t..m.i.-h 

 i- -.eparat.-il t'r..m the mu-eiilar c.iat-. tinely chopped and dip--te.I \\itli 

 :i laru'e volume of ."> p. c. phosphoric acid. Tin- fluid thu- ..bta ; ..... 1 i- 

 -fraim-d off through linen, and filtered, and lii ..... wafer is added until 

 the reaction i> ju.-t not .[iiite neutral : by thi- uie.i ipitati- \ 



' Dniwii ami H.-n-i. .MM (1880), p. 3!W. I I. IM. 



\',.||a. M-.l- -rrMtrl, ; \ IM. Mil. 



H..iir.|in-l..i. <;,,!. /;,,/. T. \, vii. (1883), |- IXN' 

 . ..iiii.-riii:iiiii. I'llu-.-r', .I,./, H.I 01. Philip- (Dutrh I' 



, (I 88 I , - Bouranelot, Compt. RrmH. 



Eonn ii-^).|-. !''" i'...nr.|iiri..i. ./ ./ ' i-'' -' ribwFlfW 



Eonn ii-^).|-. !''" ...nr.|iir..i. . . -' - 



,-r. riluirrr-- .In-/,. IM. xiv. (1877). - nU X-N M -79). 8. 



M in.. I Knit^-liin.-r. / / "I ^ Xl% 



uliis in.. I \ M. rinu'. /^ /". l'hit*ii. ('firm. IM. ll .IT. 



,/. v..l ^ (I--11. p m l"l I- 



./ ' 



'. 



I ./ ' / ' () T. . 



II r . / i: ! x.o. 1 1 ,!). S. 601. Se ko In. l-.r.v. St*r 



