14 BULLETIN 703, U. S, DEPARTMENT OP AGRICULTURE. 



one box were sprayed with powdered arsenate of lead at the rate of 

 2 pounds to 50 gallons of water, with 2 pounds of yellow laundry 

 soap added. The plants in the other box were left untreated. 

 Larvae were then confined in both boxes. The appearance of the 

 sprayed plants 23 days later is shown in Plate Y, A, and that of the 

 iinsprayed plants in Plate V, B. The larvae in the box containing; 

 the foliage to w^hich poison was applied fed but little before being^ 

 killed, while those in the other box continued to feed until their 

 larval growth was completed. 



