Yearbook U. S. Dept. of Agriculture, 1917. 



PLATE II. 



PHOTO FROM N. OAK. AG R. COLLEQE. 



FIG. 1.— A "POISON SQUAD" AT WORK. 



The men engaged in distributing poison to exterminate ground squirrels form in lino 

 and zigzag back and fortli to meet one another a-s they move across a field in search 

 of burrows. 



