FOREST PROTECTION. 159 



Where these once gain a foothold upon a sand-dune, they 

 hold it better than would be possible by artificial means. 

 In protecting such land it is generally best to dig up 

 clumps of these grasses, or use long Willow cuttings, and 

 set them in place in a wet time. 



In some sections along the Great Lakes the sand is 

 now held in place by the natural covering of weeds and 

 shrubs, but should this be removed and the land broken 

 up, there would be much trouble in getting it again fixed 

 in place. Such is the case along the southern shore of 

 Lake Michigan. 



