156 



ROBERT CHAMBERS, JR. 



P 1 



TABLE IX. 



RESULTS OF EXPERIMENT IV. THE RECIPROCAL CROSS. 

 BfGr9 X LYcf 



LR9 X LRo" 



EXPERIMENT V. 



This experiment is a repetition, during the following summer, 

 of Experiment IV. The results of both reciprocal crosses are 

 given in Tables X. and XI. 



In order to secure large numbers the parent flies were trans- 

 ferred to fresh bottles every ten days. The transfers are indi- 

 cated in the second column. 



TABLE X. 



RESULTS OF EXPERIMENT V. REPETITION OF EXPERIMENT IV. (Cf. TABLE VIII.) 



The results of the reciprocal cross are shown in Table XI. 



