362 THE BIOLOGICAL BASIS OF INDIVIDUALITY 



and to a non-leukemic strain to the parent strains ; this transmission could be 

 accomplished only in the parent belonging to the leukemic strain, perhaps 

 because here a factor favorable to the development of leukemia was active. 



All the data which have been considered so far lead, then, to the conclusion 

 that in normal tissues and benign tumors, as well as in cancers, the organismal 

 differentials are present and affect the results of transplantation, but that in 

 cancers the increase in inner growth momentum and perhaps other changes 

 which make possible an increased adaptation to environmental conditions in 

 the host, may help to overcome the unfavorable effects of strange organismal 

 differentials. 



The essential similarity between the organismal differentials of tumors and 

 normal tissues, and the similar significance which both of these differentials 

 have in determining the reactions of the host against transplants have been 

 made evident also by the recent investigations of H. T. Blumenthal, who 

 studied the effects of various types of transplants on the character of the 

 white blood cells in the circulating blood. We shall discuss his findings more 

 fully in the fourth chapter of this part, where we analyze the cellular reactions 

 in the bodyfluids which develop against tumors. 



