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THE BOTANICAL MAGAZINE. 



[Vol. XXXVI. tfo. 428. 



anaphasic chromosome groups and degenerate (Text-figs. 2. c, 3. a, b and 

 Figs. 10, 18, 29) ; vi. some chromosomes of the heterotypic and homo- 

 typic divisions form small extra nuclei (Fig. 14); vii. excess chromo- 

 somes resulting from the unequal distribution of fourteen chromosomes 

 seem in some cases to remain outside the nuclear membrane of one of 



the two daughter 

 nuclei, this is in- 

 dicated by the 

 normal number 

 of chromosomes 

 in the latter 

 (Text-fig. 3.6) and 

 seem to separate 

 into fragments 

 (Text-fig. 2. a and 

 Fig. 30); viii. 

 both in the 

 heterotypic divi- 

 sions the indivi- 

 dual chromo- 

 somes of certain 

 bivalent chromo- 

 somes move to- 

 wards the same 

 pole (Figs. 21, 22, 

 23, 31) ; ix. the 

 irregularities of 

 the numerical 

 distribution of 

 the chromosomes 

 occur in both 

 mitoses of a 

 single embryosac 

 mother-cell (Text.-fig. 3. b) ; x. more than fourteen chromosomes are 

 occasionally formed in the heterotypic division (Fig. 15). 



Text.-fig. 2. Three Embryosac mother-cells in homotypic 

 mitosis, a and c. X 1750, b. X 3500. 



Somatic mitosis 



The mode of segmentation of the spireme into chromosomes in 

 the somatic nuclei seems not to have been determined by the previous 



