Griccs: THE SUGAR GROVE FLORA 499 
their ranges affords a favorable opportunity to study also their 
behavior. ‘Are they rare or abundant? Does their reproductive 
apparatus function normally? Do those plants on their northern 
_ edges behave differently from those on their southern? The 
eastern from the western? Is it possible to assign any reasons 
for the location of their termini here rather than fifty or a hundred 
miles beyond? These questions will be considered in a following 
paper. 
OHIO STATE UNIVERSITY, ” 
CoLumBus, OHIO. 
