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



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. 



