28 



MARY DRUSILLA FLATHER. 



t\vn pun.- lines, and the- variations among individuals from the 

 culture are not so great as the variations among ind viduals 

 within either pure line. From this we may conclude that there 

 is (i) no significant variation in the pulse frequency of individuals 

 in different pure lines kept in the same physiological environ- 

 ment, (2) no significant similarity in the pulse rate of individuals 

 in the same pure line kept in the same physiological environment, 

 (3) no significant clivers' ty in the pulse rate of individuals from 

 a wild culture kept under approximately the same conditions in 



TABLE I. 



PULSE FREQUENCY UNDER NORMAL CONDITIONS. 



(Given in Seconds.) 



Pure Like A. 



Pure Line B. 



