356 



Kansas State Board of Agriculture. 



FIG. 305. Typical area of badly infested alfalfa field. This tract (54 ft. x 72 

 ft.) was caref \jfcly mapped after first dividing it into small squares by tightly stretched 

 lines. The small irregular patches show the shape, relative size and location of the 

 mounds thrown up by the gophers. [Courtesy Kansas Experiment Station.] 



Fia. 306. Same tract as above, with all the runways carefully excavated and mapped. 

 [Courtesy Kansas Experiment Station.] 



