( HKMICAL j;AMS OF TIIK ANIMAL BODY. 1"! 



during the solution of the cellulose may, if they are oxidised in 

 the body, contribute to its energy and thus be of u> 



Tunicin i < ', ; H J0 >,). 



This substance constitutes the chief part of the mantle of Tuni- 

 cate (Ascidians) and appears to have been first described 1 

 Schmidt.- who drew attention to its similarity t> vegetable cellu- 

 lose. This view was confirmed by Berthelot, \vli< . h< >\\ 

 that it is much more resistant to the action of at ids than : 

 cellulose/ 1 In other respects the two may be regarded as i<leir 



>nlam-e with this it is found that tunirin is soluble in 

 Bohweuer's reagent (see above), from which it may be reprecip- 

 '. by hydrochloric acid and thus purified. It is further 

 coloun-d blue by the addition of iodine after preliminary b 

 nn-nt \vitli sulphuric acid. It is soluble in concentrated sulphuric 

 aci.l. ami if uat.-r lc added to this solution ami it be boiled for 

 >ome time, a su^ar which is apparently identical with ordinary 

 dextrose is obtained. 4 



1 in the pure form by treating the mantles for some 

 days with water in a Papin's digester, then in succession with 

 boiling dilute hydrochloric acid, strong caustic potash and water. 

 A-, thus obtained it retains the form of the parent tissue. 



THK SiuARS. 



The researches i,f Kmil Fischer have thrown a Hood of li^-ht on 



I t he sugars.'"' In jthenyl-hydraxin <',H,.NHNII 



i reagent which forms with the sugars compounds 



known as hyd: md osazones. These provided for tin- first 



time by their various solubilities, melting-pointt, and rotatory 



l\iate means of detecting, sepa n.l char.- 



:he several members of this class of carbohydrates. Hence 

 possible to investigate the occurrence of sugars among 



1 ]'l"i!ucts of the reactions employed III the. 



H! -\llthetir ppnllict io||. It W..ul,l 



b- -re to enter into the details ! 



.iv that he h.is ni>t m.-i .tlieti-*ed both 



i < >., ti,.. ahore Me Webke, Cktm. Ctrtra, - b*rjc 



1.1. Wik .olM a. FtecMf. 



I.M (1S46), > -IIH. 

 I 149. 



/. d. ektm. OttA I8T, S. 1938. Compt. fad. T I\\M\ 

 755. Seh&fer, UeWg'* A* > .S .312. 



Fiwh-r HM given coodBMd accon wurhM. 



- ,l..-h*m '-..-//. Jhrfc xxili. (IWK)), ^ .'IU >( tin* an 

 / Ckt i90, p. ISSS. KM abo SchaUt. ll.oi. Ctntralb. 



