SEX AND HEREDITY 



^C': 



3. The spore-mothcr-ccll has now completely separated from 1: ^.. 



bours, and is roughly spherical. The nuclear enlargement noted before b 



Fig. 393- 



Drawings by Dr. J. M. Thompson, reprcsi-iiting in detail twelve succ««ii\-o »t«f«« 

 in the tetrad-division of the poUen-mothcr-ccU of Allium Ursmum. ( < 1000 ) hoc 

 the detailed description see Te.xt. 



laintaincd, but the linin-reticulum is resolved into a deiunte nuinlH-r (in \\\\s 

 ? sixteen) of slender chromosomes. A nucleolus is still recognisable. 



