/ LEIGH E. CHADWICK 57 



In all three areas considered, the need for further study is evident. Little 

 has been done as yet from the point of view of comparative physiology ; and 

 there have been no investigations of the temperature dependence of these 

 reactions in the living organism. These gaps will have to be filled, and the 

 anomalies that have come to light must be explained before useful general- 

 izations about the system will be possible. 



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