IOWA ACADEMY OF SCIENCES 
63 
The writer has not previously recorded the spermaphytic xerophytes 
found growing with these lichen societies of the calcareous earth and 
rocks, and it is through the aid of Dr. Cowles that he is able to do so 
in this instance. The whole area of the till of the region, as well as 
the more limited esker would form a most inviting field for extended 
ecologic study, if indeed natural conditions are not already so much 
interfered with as to make a complete and exhaustive study impossible. 
In closing the writer wishes to express his thanks to Miss Julia 
Fink for aid in the study, especially in securing the photographs and 
to Miss Maude Norris for drawing the man, which accompanies this 
paper. 
