2 
i 
72 W. P. Blake on the Gold Region of California and Oregon, 
7th. That if the composition of different proximate principles — 
is the same in very nearly allied species, the form and the sie — 
of vitellin granules vary in a manner sufficiently appreciable to — 
be able to be recognised and assigned to each species. 
8th. That the albuminous substances furnished by eggs of — 
birds, reptiles, fish, crustaceans, present in their cheinical proper — 
ties and in their point of coagulation, differences which permit us — 
to suppose that these bodies are made up of different proximate — 
principles. 
9th. That an egg changes its nature,—that its liquids alter con- 
“siderably at different epochs of its formation, when detaching — 
Em 
selves from the ovary, and resting in the oviduct before being — 
. After having established in the eggs of different animals, 
nce veral new proximate principles, icthin, ichthulin, 
iydin, and comparing these results with those which 
mate principles’ which ‘wi 
name of Vitelline substance 
