PLATE HI. 

 OVA Or" THE COMMON STICKLEBACK. 



PRODUCTION OF Niw LIVING CENTRES IN PRE-EXISTING LIVING MATTER. 



Fie. 



Fi 



.an ova und^ 

 . the midst of a d- 

 - comj osrd i : 



diametc 





:an ovum, with lanje terminal vesicle. 

 oik cracked and s ra- 



diating outwaids. Magnified 100 diaru 



Gerrnin.il <. ors t'rom n ruptured germinal vesicle. X o-"0. The 

 ovum was 7 ,\ uirli in diatnrter, and the germinal vesicle 5^75- 



. 10. 







tnely sm n/cl spots, with uew 



ceu 





Germinal spots, with new centres (nucleoli) 

 more minute . i mmal spots 

 in t ] : 



ICOOth of am , , x 



x 550. 



r/ 



[To face pa,i 



