196 FORESTRY 



Improving the stand. In the millions of farm wood 

 lots the farmers can do very important work in forestry 

 by improving the stand of trees. Diseased trees 

 and species of little value should be cut down and 

 replaced by trees of high value. Each wood lot should 

 also carry a full stand of trees. In order to im- 

 prove the wood lots the farmers should know the lead- 

 ing species of timber trees, the uses of each species, 

 the market demands, the best methods of dealing with 

 diseases and insects that attack forest trees, the effect 

 of grazing upon the wood lot, and the best methods of 

 growing and transplanting young trees. 



Arbor Day. In order to encourage tree planting 

 and arouse an interest in the general problems of for- 

 estry, many states have selected one day in the fall or 

 spring as Arbor Day and made it either a legal holiday 

 or a school holiday. While much good work has been 

 done on Arbor Day, yet in the whole country millions 

 of young trees set out on this day have died because 

 the work was done so poorly. Since the planting of 

 young trees is practical work in forestry, the pupils 

 should do it so well that the trees will continue to grow 

 after planting. 



QUESTIONS 



1. Where are the great forest areas of the United States? 



2. For what purposes are trees planted in the prairie region 

 of the United States? 



3. How do forests lessen floods ? 



4. Of what service are forests to irrigation? 



