850 



Fig. 385 a- Differentiation of the Germ Cells and the Somatic Cells 

 During Oogenesis in Dytiscus. (After GIAEDINA, 37.) 



(Pig. 7 is a reconstruction from the author's various illustrations). Fig. 

 A, oogonia Oi in preparation for division. Fig. B, The same in a somewhat 

 later stage; separation of the isolated chromosomes from a continuous reticular 

 mass of chromatin. Fig. C, Dissolution of the nucleus; the chromosomes enter 

 the spindle, while the remaining chromatin undergoes transformation and forms 

 a compact ring-like body situated around the spindle, as represented in Fig. 

 D in side view and in Fig. E in polar view. Fig. F presents the moving away 

 of the ring-like body outside of one of the poles of the spindle. It thus becomes 

 incorporated exclusively with the lower one of the daughter cells, oogonia O 2 

 as presented in Fig. G. Fig. H presents the resting nucleus of the oogonia O% 

 formed by the chromosomes and externally united with the ring-like body, which 

 has also acquired the nuclear shape. When O 2 is preparing for the process of 

 division, the same separation of the constituents becomes visible (Fig. 7.) 



(BOVERI.) 



