308 



A. M. FIELDE. 



were endurance of heat, 1 submergence in water, deprivation of 

 food, excision of parts of the body, or administration of poison, 

 the larger the ant, the more probable its survival. 



FIG. I. Camponotus pennsylvanicus worker. < 6. From a photograph taken by 

 Mr. J. G. Hubbard and Dr. O. S. Strong, and retouched by Dr. J. H. Macgregor. 



There appears to be also a relation between size and natural 

 longevity. Two hundred Stcnamma fnhnim picaim workers, 



'See paper referred to in previous note, BIOLOGICAL BULLETIN, June, 1904. 



