EOLIAL OR WIND-LAID DEPOSITS 



59 



what is called a "blowout" (Fig. 5G). The tendency is for this 

 to increase in size and often results in ruining large areas. To 

 reclaim these " blowouts " it is necessary to grow legumes, plants 

 able to take their nitrogen from the air. The black locust (Pig. 57) 



FIQ. 56. Large "blowout" in sand area. Numerous small ones may be seen in the dis- 

 tance. Mason County, Illinois 



Fio. 57. Black locusts (Robinia pseudo acacia, L.), growing on sand to the right, drifting 

 sand mi left. (L. A. Abbott.) 



is probably one of the best, although if the common sensitive plant, 

 the partridge pea (Cassia chamcecrista) , can get a start it will stop 

 the movement. The trailing wild bean (Fig. r>S) is another plant 

 that grows luxuriantly on sand and does much toward building up 



