258 BOTANICAL GAZETTE [APRIL 
a controlling factor in the process. Cell division, in this instance, is 
regarded as a cytoplasmic phenomenon, since the nuclei may be 
remote from the place of constriction; and, further, they appear to 
have nothing directly to do with the process. The ultimate necessity 
of the presence of a nucleus, probably as a controlling factor of nutri- 
tion, is proven, however, by the early death of the enucleate basal 
cells cut off from the conidia and from the end-cells of germ-tubes. 
UNIVERSITY OF WISCONSIN, 
Madison 
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