 Yation a 
Color when mix 
G. F. Barker—Physiological Chemistry. 235 
ether, not at all in absolute alcohol and water, norin ammoni 
sodic hydrate, dilute mineral acids (non-oxydizing) or dilute 
acetic acid. 
2. On the coloring matter of the yolk of eggs. 
STiapELer* has made some experiments with the coloring 
matter of the yolk of the egg, in order to make a comparison 
between it and the bile pigment, to which it had been compared 
by Chevreul, 
If the fresh yolk be agitated with ether, the coloring matter 
and the fat are dissolved, and the solution leaves upon evapo- 
with a few drops of concentrated sulphuric acid. If this 
Stponity the fat, an unpleasant odor like that of fish livers, 
8 developed ; and upon agitating the saponified mass with 
ether, it is deprived of all its coloring matter. This behavior 
_ Pfoves the absence of bile-pigment, since the compound of bili- 
— Tubin with 
: copaaed With the fat containing hematoidin, obtained from 
sie s Vi ° 
; - tint, Which is transie 
aries. Nitric acid, when colored, develops a pure blue 
nt. Ether and chloroform dissolve it toa 
‘ St yellow, solution ; this, mixed with alcohol and treated with 
zs 
ee 
nitric acid, is simply decolorized, affording no play of 
* J. pr. Ch, c, 148, March, 1867. 
