238 ELERY R. BECKER. 



may have the advantage over free living protozoa in possessing 

 greater amounts of it. 



My thanks are due to Professor E. X. Harvey, of Princeton 

 University, for his suggestions in regard to the apparatus. 



REFERENCES. 



Bayliss, W. M. 



'15 Principles of General Physiology. London. 

 Cleveland, L. R. 



'24 The Physiological and Symbiotic Relationships between the Intestinal 

 Protozoa of Termites and their Host, etc. BIOL. BULL., 46: 177-225. 



