28 



A PRIMER OF FORESTRY. 



much more conspicuous, and the smaller the region the 

 more noticeable often is its effect, because the contrast 

 is more striking. Thus it is frequently easy to see the 

 difference between the trees in a swami) and those on a 

 dry hillside near by, when it would be far less easy to 

 distinguish the general character of the forest which 

 includes both swamp and hillside from that of another 



Fig. 25.— Cypress in a hollow. Pine on the slightly higher land near by. Wet 



weather spring, Southern Georgia. 



forest at a distance. (See fig. 25.) In many instances 

 the demand for water controls distribution altogether. 

 For this reason the forests on the opposite sides of 

 mountain ranges are often composed of entirely differ- 

 ent trees. On the west slope of the Sierra Nevada 

 of California, for example, where there is plenty of 

 moisture, there is also one of the most beautifull of 

 all forests. (See fig. 20 and PI. XIII.) The east 



