334 EDWARD F. ADOLPH. 



rium with their environments (Quinton, '04). Thus it turns out 

 that while the essential physiological constitution of the tissues 

 of the two groups of animals does not differ, the limiting factors 

 for the proper functioning of their regulatory integuments differ 

 vitally. 



It seems probable that the transition from one type of integu- 

 mental permeability to the other type occurs automatically 

 during the long process of acclimatization which accompanies 

 the transfer of an organism from one aquatic medium to the 

 other; that both types are inherent in all integuments. 



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