318 



SECRETION. 



FIG. 12. 



E_J 



first decoction, strained through a cloth, and the opaline liquid 



which passes through is made into 

 a thin paste with animal charcoal. 

 The paste is then put into a dis- 

 placement apparatus, the end of 

 which is loosely filled with shreds 

 of moistened cotton. By success- 

 ive washings, the paste is ex- 

 hausted of its glycogenic matter, 

 leaving behind the albuminoid 

 and coloring matters. The whit- 

 ish liquid, as it flows, is received 

 into a vessel of absolute alcohol, 

 when, as each drop falls, the gly- 

 cogenic matter is precipitated in 

 great, white flakes. This is fil- 

 tered and dried rapidly in a cur- 

 rent of air. If the alcohol be 

 M pn not allowed to become too dilute, 



the matter when dried is white 

 and easily pulverized. The ap- 

 paratus used by Bernard is repre- 

 sented in Fig. 12 : A B, displace- 

 ment apparatus in which the 

 filtration takes place ; C, animal 

 charcoal mixed with the decoction 

 of the liver ; E, glycogenic solu- 

 tion ; M, lamp-wicking, attached 

 to a thread, passing through the 

 carbon, and coming out at the 

 upper part of the apparatus ; I, 

 precipitating-glass ; G, glycogenic 

 matter precipitated ; Y, alcohol. 1 

 The substance thus obtained may 

 "be held in suspension in water, 

 giving to the liquid a strongly 



2 BERNARD, op. dt., p. 120. 



