212 C. B. BRIDGES AND A. H. STURTEVANT. 



Wild Type. lilack. Curved. Black Curved. Total. Total No. Eggs. 



34 91 96 32 253 550 



Thus although less than half the eggs produced flies, there is no 

 evidence of differential variability, since the complementary 

 classes are approximately equal, as expected. 



COLUMBIA UNIVERSITY, 



January, 1914. 



