190 BOTANICAL GAZETTE [FEBRUARY 
to changes in environment. Here there are marine and fresh- 
water species living together under semimarine conditions, and in 
Minnewaukon Bay, where the water changed from saline to fresh, 
the diatoms that had been living in the saline water seemed to 
have been in no way affected in one season by the change. In 
Court Lake, the water of which has never been salt, there is one 
species whose habitat is reported as ‘‘marine or brackish.’’ Its 
presence here may be explained by the nearness of Court Lake to 
salt water, making it easy for it to be introduced; and its continu- 
ing to live there may be explained by its adaptability to various 
environment. 
Should the lake continue to diminish in size, its salinity will 
probably increase; and at the same time other bays will be cut off 
and become separate lakes. These changes will furnish interesting 
material for study, not only of the diatoms, but of all other organ- 
isms inhabiting the lake. 
Granp ISLAND COLLEGE 
Granp IsLanp, NEB. 
