IMPROVEMENT OF GRASS LAND 181 



some cases an old grass mower, may be brought into 

 requisition in June and July. Thorough work is neces- 

 sary, and the ground should be covered a second time 



Photo, 1909. H. C. Long, 



FIG. 50. Creeping Thistle (Cnicus arvensis Hoffm.), showing extensively 

 creeping roots. 



after an interval of two or three weeks wherever 

 possible. The seedlings appear as rosettes of leaves 

 in the autumn and early spring, at which times the 



