Bull. 17, Biological Survey, U, S. Dept. of Agriculture. 



Plate VIII. 



Fig. 1.— Tobacco Field of Lot 2, where the Effect 

 OF Birds upon an Uprising of Tobacco Worms was 

 Studied. 



Fig. 2.— Sweet Potatoes and Pear Orchard, where 

 Various Investigations were Made. 



