178 ADA R. HALL 
This work was undertaken at the suggestion of Dr. J. F. 
Bovard at the zoological laboratory of the University of Oregon. 
I wish to express my appreciation to him for his kindly. interest 
and many helpful suggestions both in the experimental work and 
in the revision of this paper. I am also indebted to Dr. C. H. 
Edmondson for the assistance and inspiration which he has 
given me. 
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