ADAPTATION OF PARAM.ECIA TO ENVIRONMENTS. 65 



difference, but I believe that the fact that these two races belong 

 to different species is merely an incident and that it will be found 

 in be equally a variation of different pure races of the same species 



.1- tin n -nils of Jennings clearly indicate. 1 



CONCLUSIONS. 



1. The discrepant results of various workers on the longevity 

 it" p.ti. i in. iii. i is in all probability due to variations in the cultural 

 driii. md- of the races isolated for study. 



2. It is probable that most, if not all, normal indi\ idual.- ha\ e, 

 under suitable environmental conditions unlimited po\\rr ot 

 i. prodiK tion without conjugation or artificial stimulation. 



SHIM ii ii' BIOLOGICAL LABORATORY. 

 V.M i 1 'NIVERSITY. 



I' mi:!', llar^itt: loc. cit.. p. 538. Jennini:-: .\m<r. \atur, i '. \.>1. 45, 



, i<n i 



