3 88 



A. J. GOLDFARB. 



TABLE III. 



SHOWS CHANGE IN TOTAL CLEAVAGE WITH PROGRESSIVE AGE OF GERM CELLS. 



Toxopneustes AND Arbacia. 



Toxopnuestes. 



Arbacia. 



1 Probably an error in recording. 



Fig. i represents schematically the change in rate of cleavage 

 with age. 



