LIMIT OP PHYSIOLOGICAL WATER 



49 



Comparative Plot II. 

 Three species, Phaseolus vulgaris, Hordeum vulgare, and Zea 

 mays, grown in the plant cases under four different combin- 

 ations of physical factors. 



Plot P-1. 

 Below are given the results obtained from thirteen species 

 grown in the plant house under similiar conditions except soil. 



