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



PLATE III. 



PHOTO FROM N. DAK. AGR. COLLEGE. 



FIG. 1.— A FEW OF THE MILLIONS OF GROUND SQUIRRELS KILLED 

 IN THE NORTH DAKOTA CAMPAIGNS. 



Three species are shown, the striped or thirteen-lined, the short-tailed Richardson, 

 and the bushy-tailed Franklin ground squirrels. 



FIG. 2.— ONE DAY'S KILL OF PRAIRIE-DOGS IN ARIZONA. 



Sixteen hundred and forty-one dead prairie-dogs were collected from 320 acres which 

 had been treated the day before by one man. Eighty quarts of poisoned rolled 

 barley were used, the total cost, including labor, being S9.79. Only a part of the 

 prairie-dogs poisoned are Shown, as a large proportion of them die in the burrows. 



