LEAF-STRUCTURE AS RELATED TO ENVIRONMENT 
559 
In conclusion I wish to acknowledge my indebtedness to Dr. J. E. 
Weaver, who suggested this investigation and assisted in securing a 
pare of the data obtained during the summers of iqi5 and 1916. I 
also wish to express my appreciation of the encouragement offered by 
Dr. Raymond J. Pool and of the facilities afforded by the depart- 
ment of botany at the University of Nebraska. 
The University of Nebraska 
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