Bui. 77, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate X. 



Exceptionally Favorable Conditions and Boll Experiment. 



Fig. 1. — Section 10, a, bolls exposed on surface; b, corner where bolls were buried 2 inches 

 deep, started December 6, 1906; emergence ceased May 2, 1907; survival, 4.51 per cent. Fig. 2. — 

 Section 9, stalks left, started November 13, 1906; emergence ceased June 19. 1907; .survival, 25.92 

 per cent. (Original.) 



