78 EFFECTS OF OVER -FEEDING GRASSES. 



agree in several respects, and belong to the same tribe, 

 HordeecB. In each case, free use can be made of the excellent 

 illustrations, but the careful examination of each species must 

 not be omitted. 



Another lot of closely related species are sweet vernal, canary- 

 grass and vanilla grass. One genus contains June grass, wire 

 grass, fowl-meadow grass and a few others which are common. 

 Orchard grass is of fair size and well suited to the beginner. 



It is an excellent plan, where possible, to take up in connec- 

 tion with each other, especially in reviews, grasses which are 

 nearly related. Any two such species may very profitably be 

 critically compared. 



" There is no way for the student to do but to take the thing 

 described in his hand, and patiently compare it with the defini- 

 tion given, until he distinctly sees the application of every part. 

 He must, therefore, take a cornstalk or some other grass, and 

 study its structure until he has made out every statement in the 

 definitions given." (Gould). 



CHAPTER V. 

 NATIVE GRAZING LANDS. 



Effects of Over-Feeding Dry Districts. The grazing of 

 sheep and cattle often change the character of vegetation for the 

 worse instead of better. 



Every farmer knows the value of sheep to exterminate wild 

 raspberries, blackberries and most other bushes, but many times 

 they also introduce troublesome weeds as well. 



Dr. A. Gray, in Am. Jour. Science in 1874, notices a contribu- 

 tion by Dr. Shaw to the Linnean Society, in reference to the ill 

 effect of overstocking the dry grazing districts of Southern 



