1913] SHULL—SEMIPERMEABILITY OF SEED COATS 197 
16. The unusual intake of water noticed with certain substances, 
especially with certain acids and alkalies, is due largely to the 
development of osmotically active substances inside the semi- 
permeable membrane. 
17. There is some evidence unfavorable to Aneione S 
hydrone theory of selective semipermeability. 
UNIVERSITY OF KANSAS 
LAWRENCE, KANSAS 
LITERATURE CITED 
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IQI2. 
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