INDIVIDUALITY OF GERM XUCL1 I. 405 



embryo becomes older and is comprised of many more cells very 

 few of the cells are found containing two nuclei, as for instance 

 about tin- ;?5o-cell stage only two such cells were found in a 

 section Fig. i, I-J). Beyond that stage no cells have been 

 found containing two nuclei. 



B 



V 







- .1 Ic cell of a female embryo developing from a parthenogenetlc 



Imwiiij; 51 chromosomes; B, somatic cell of a male developing (mm a partheno- 

 !i(i\vin^ ^5 i-liromosomes; C. the two nuclei of a matured and fertilized 

 hrmnosomcs in each nucleus; D, a 1 ''indie from a somatic 



r.Il <>f an ciiil.tvn developing from a fertilized egg. Drawings somewhat dia- 

 ! of minute size of chromosomes. 



Mitdic tii;ui-rs occur showing double spindles which seem to 

 indicate thai the two nuclei divided independently of each other 



in cell di\ i>i'i: I '-.2,D). \Vhythisoccursonlyinthecellsin 

 27 



