196 



STUDIES OF TREES 



trespassers against starting fires are commonly posted in 

 such forests. (Fig. 143.) 



The grazing of sheep, goats and cattle in the forest is 

 another important source of injury to which foresters must 

 give attention. In the West this is quite a problem, for, 



FIG. 134. Sheep Grazing on Holy Cross National Forest, Colorado. 

 The drove consists of 1600 sheep, of which only part are shown in 

 the photograph. 



when many thousands of these animals pass through a 

 forest (Fig. 134), there is often very little young growth 

 left and the future reproduction of the forest is severely 

 retarded. Grazing on our National Forests is regulated 

 by the Government. 



As a means of protection against insects and fungi, all 



