July 26, 1912] 



SCIENCE 



125 



until twelve to fifteen were produced, one of membraneless cell, the first pole-cell. This 



which, lying at the pointed pole of the pseudo- then divided into two and later into four cells, 



vum, became surrounded by a thick, dark These four then separated into two groups of 



yolk mass and with it separated as a distinct two cells each and were recognized as the 



cl.ii= clen.tfo.^e YVM.t\e«.'i 

 oj- so«..t.c tells 



p.b.- polar b.da 

 pjc-primorji'it jetm <i«.U 

 p.fli'polinres "PUlwa." 



nry oocyte 



tmojejm glanis | 

 of ^.ur oojohi't I 



Utoui"tti Krioil 



Each oJ t^ oojinia 



becomes a 

 prlmarij oocyte 



Htsfort^ of fU Qerm Cells oj /Ijastor 



