458 BOTANICAL GAZETTE [JUNE 
carried, and the migrations of other animals in the state are too irregular 
and insignificant to be considered as a factor in the question. 
On the other hand, it is also possible that the moraine is not too 
high to be passed by southern plants, and that stations have been 
established upon it during favorable periods which were occupied long 
enough to permit the plants to gain a foothold on the other side, and 
then the intermediate stations, because of a series of successive unfavor- 
able years, have been destroyed. 
In whatever way the matter is finally decided, the fact which is 
worthy of record at this time is that these plants occur at this point 
and that they thrive there and are thoroughly at home. 
It is probable that similar tracts of land in Bay and Saginaw count- 
ies will yield the same species, thus extending their range still farther 
northward.— Cuarves A. Davis, Alma College, Alma, Mich. 
