April, '12] 



JOURNAL OF ECONOMIC ENTOMOLOGY 



Plate 2 



Fig. 1. Arsenate of lead. 



l''ig. 2. Arseiiite of zinc. 



Fig. 3. Paris green. 



Photographs of arsenical insecticides sprayed on glass to show the distribu- 

 tion of each. The larger size of droplets in Fig. 1 is not of special significance. 

 All magnified 8 diameters. 



