36 DRY FARMING 



boundary of Canada it may be seen in the Rocky Moun- 

 tains at an altitude of 6,000 to 8,000 feet and at the 

 equator it is found only after reaching the height of 

 16,000 to 18,000 feet. 



26b. The Effects of Forests on Climate. — The effect of 

 forests on climate is to lessen the extremes of precipita- 

 tion, evaporation, wind velocity and to some extent the 

 temperature. How much the forests of North-western 

 Canada affect our climate it is difficult to estimate. In the 

 practice of farming its greatest influence is probably 

 found in lessening the wind velocity and thereby the 

 evaporation and danger from soil erosion. This favor- 

 able effect is, of course, greatest in the wooded areas and 

 least in the prairie and Chinook belts. 



