!ul. 50, Bureau of Entomology, U. S. Dept. of Agriculture. 
Plate XVII. 
Fig. 1.— Large Breeding Cage. 
Used at the Paris laboratory iu deterniiiiiiig gent-rations of tlie bollworm. Planted to corn 
(original ). 
Fig. 2.— Same, Planted to Cotton Later in the Season (Original). 
