122 



A. FRANKLIN SHULL 



this contradiction, it was deemed necessary, notwithstanding the 

 very large difference obtained, to repeat the experiment. 



Experiment XVII. The temperature experiment was twice 

 repeated, on a less extensive scale, during the time when the prin- 

 cipal experiment was in progress. In one repetition (A, table 19) 

 a female was removed from room temperature to the ice-chest; 

 in the other (B), the female was removed from the ice-chest to 

 room temperature. Sister individuals became the parents of the 

 two lines in each case. 



TABLE 19 



Showing data of two temperature experiments, in each of which one line ivas bred at 

 18° to 23° C, the other at 7° to U° C. 



*Remainder of family not recorded. 



