130 BOTANICAL GAZETTE [februaw 



figs 



asm. The stages in this process are 



still in contact with the membrane of the parent; figs. 6, 12, 13, 18 

 cases where the karyosome has separated from the parent, but the 

 membranes remain in contact; figs. 3, 5, 9, 14 cases where the two 

 nuclei have separated, but still lie close together. 



Division by nuclear gemmation occurs also in the spirem stage 

 (figs- I 5~ I 7)- In this case the division of the chromatin takes place 

 at the time of spirem formation and cannot be definitely connected 

 with nuclear division, but the manner of the separation of the daughter 

 nuclei is the same as that already described. Figs, i, 2 show groups 



(fig 



spirem. 



In cysts where the nuclei are numerous and evenly scattered 

 through the cytoplasm it can be seen that the peripheral nuclei 

 divide much earlier than the central ones. Groups of small nuclei 

 are always found at the periphery before the large nuclei in the center 



Thus a lateral section of a cyst (fig. 1) shows only 



are much divided. 



groups of small nuclei , while the central sections show numer 



fig 



ferent cysts. 



gemmation 



dif- 



figs 



few small nuclei present are scattered singly through the cytoplasm. 

 In this case the appearances indicate a slow' and orderly formation of 



small nuclei. 



seems to be extruded 



with almost explosive violence (figs. 24-26, cf. also Glaser 6). h 

 these cases a large proportion of the migrating chromatin never forms 



Some members of almo 



their last 



asm 



disintegrate, forming in 



asm 



Such disintegration is 



small 



gradual formation. It is more pronounced in younger cysts where 

 there are only a few parent nuclei, than in later stages where they are 



numerous. 



membrane 



from 



mother karvosome to microsomes 



membrane 



both 





