Muscular Tissue of Pecten irradians. 31 
These results indicate that the composition of the precipitate 
is not constant. 
The amount of glycogen occurring in this muscular portion 
of the scollop is quite large; at one time, from three quarts 
160 grams were obtained ; at another, two quarts yielded 70 
rams. 
charcoal. On further evaporation the fluid deposits white pris- 
matic crystals. The crystals have a sweet taste, but upon 
ignition with soda lime, ammonia is evolved, evincing the pres- 
ence of nitrogen, which at once separates it from the saccharine 
group. The crystals first obtained were not quite pure, but 
after treatment with animal charcoal and recrystallization gave 
by analysis a result corresponding to the composition of glyco- 
coll. ‘T'wo more distinct preparations were made and gave by 
analysis : 
Ist Prep. 2d Prep. 3d Prep. Calculated. 
; 2. C,H,0,NH,. 
C 31°98 31°99 32-09 31:97 
H 6°88 6°84 6°79 6°81 6°66 
1957 18°58 18°49 18°45 18°66 
O 42°57 42°59 42°63 42°67 42°66 
The impurities which seemed to be the most difficult to re- 
move were coloring and inorganic matters. The crystals were 
soluble in water and weak alcohol, insoluble in ether and 
absolute alcohol. An aqueous solution, when treated with sul- 
phate of copper and sodium hydroxide, assumed an azure blue 
color without separation of cuprous oxide on heating. The sub- 
stance melted at about 180° U, then decomposed. With nitric 
acid fine crystals corresponding to nitrate of glycocoll were ob- 
tained. ese analyses and reactions identify the substance as 
ey porn, which I believe has never before been found in 
ature. 
A preparation was now made in which the alcoholic filtrate 
The amount of glyeocoll occurring in the tissue is small, 
although where two or three quarts of material are used a fine 
crop of crystals may be obtained. 
* Lehrbuch der Physiologischen Chemie, Gorup-Sesanez, page 236. 1875. 
