THE RELATION BETWEEN AMITOSIS AND MITOSIS. 113 



nucleus or cytoplasm. No spireme has been observed but a 

 number of deeply staining granules appear in the nucleus in ad- 

 dition to the karyosome. The yolk appears first in the form of 

 small granules which increase in size and fuse, until the cell con- 

 tains a single large spherical mass of yolk and the greatly reduced 

 nucleus is flattened at one side. Successive stages of yolk-de- 

 velopment are shown in Figs. 31-35. These cells apparently 



FIGS. 29-35. 



arise from the same primordium as the ova but have become 

 specialized in the direction of yolk-production. The process of 

 yolk-formation is not identical with that in the egg but this dif- 

 ference is probably correlated with the extreme specialization. 



VIII. CONCLUSION. 



Extended discussion is better postponed until other data have 

 been presented, but the most important facts of this paper may 

 be briefly stated as follows. 



