Death to the Rodents. 



429 



tion of California. Improved methods for controlling pine 

 mice, wood rats, and other seed-eating rodents also were 

 developed. 



BIS593; BIS59S 



Ground-Squirrel Work in Grain Fields. 



The upper view is of a field of oats, showing along the border the usual 

 results of ground-squirrel activity in destroying the growing crop before eradi- 

 cation work was undertaken. A loss of 10 to 30 per cent of a field of grain 

 occurred commonly before the cooperative campaigns were launched. The lower 

 view is from a photograph of a field adjoining, where damage was prevented 

 by poisoning the ground squirrels on the planted area and on adjacent fields 

 of pasture land. Here it was possible to harvest a full crop from the entire 

 area planted. 



Cooperation. 



During the spring of 191G the extended poisoning cam- 

 paigns undertaken in Xorth Dakota against ground squir- 

 rels — locally known as "gophers" — had the cooperation of 

 the experiment station and extension service of the agricul- 



47094'— 21 2 



