396 Recent Literature. [April, 
This is the history of the yolk-mass after the embryo is hatched, 
but as it grew in size before hatching, yolk absorption must have 
taken place before the heart was sufficiently developed to be an 
active agentin the process. This must be by intussusception, andin 
the amber yolk-covering it is undoubted that a process of cell and 
blood-cell differentiation takes place. Mr. Ryder concludes that 
the body cavity, and the outer covering of this, though ni) 
ab of an inch in thickness, contains epiblast, mesoblast, and ! 
preponderance of characters was toward the female parent, 
teeth were more numerous and the gape of the mou! 
The fungus or alga, that is so fatal to shad “oe x 
wherever there is any imperfection in the circulation 0" - 
bodies of some large gold-fish that had become infe rely. 
(probably derived from dead shad-eggs) failed comp 
Livingston Stone states, that a strong solution of mr 
while Mr. Behler recommends a saturated solution 
young fish come out all right, the asphalt gradually ig 
A fifth note relates to feeding young shad with Dap 
when transferred from. the carp-ponds to the aquari" el 
served to die rapidly. The lower temperature w th 
cause, but the principal reason was doubtless the A 
tozoa, algæ, etc., which form the proper foo l 
crustacea. 
Another note refers to methods of handling r 
_ of the white perch, and another to the proved ¢ rere 
sticklebacks to shad larve. Twenty-five of pany 
in half an hour by four Afeltes quadricornis, 
