62 



ihe section cuts through a chromatin bus 

 at rig spi .At the ext] t is 



found, for the first time, a nucleus in the outer peri- 

 blast, -blast in this ci is very rich in 

 nuclei dividing by mitosis, A curt ination s S 

 one vertic 6- horizontal ones. Another blasto- 

 derm, of t . stage, contains , in its j 

 blast, thirty-three oblique spindles at all angles fi 

 nearly vertical to nearly horizontal, i 

 horizontal] - vertical posit i 

 in all sixty-nine spin I (none twice). There 

 a a very few solidly staining nuclei, but a aber 

 are ci.it, as above, t eee 

 are not c . There can be no doubt I 

 stand - sitions. 



Last ! . 7- . The cells 



tot uniform in size, a 

 LI ones. ^ciei stan: solidly, out s 



contain spindles, Two bi-nucleate cells arc present, 

 one i] ;ing very . This condition 



is far from rare in thi: . 



cases have been particularly no . The periblast is 



thick, yolky, and distinct. It c s sei u- 



