PLANTS FORESTRY 237 



proper direction accidents are avoided and the goal is reached 

 much more quickly. 



References : 



1. 1407:500-513. Plant Breeding. 



2. 1503 : 116. Budding and Grafting. 



3. 1605 : 36-55. Propagation of Plants. 



4. Farmers' Bulletin No. 157. The Propagation of Plants. 



5. Farmers' Bulletin No. 409. School Lessons on Corn, 

 a. 1402 : 20-22. Propagation of Plants. 



6. 1404 : 19-29. Propagation by Means of Roots and Stems. 



c. 1502 : 155-180. Propagation. 



d. 1505 : 121-128. Bud Propagation. 



e. 1606 : 112-123. Growth of Plants. 

 /. 1606 : 132-140. Propagation. 



g. 1608 : 148-156. Propagation of Plants. 

 h. 1609 : 314-315. Modes of Reproduction. 

 i. 1611 : 91-105. How Plants are Propagated. 



172. PLANTS FORESTRY 



While the effects of climate, soil, and water upon plants and 

 all vegetation are very great, yet plants, in large masses, have 

 a reciprocal effect upon these very factors which determine 

 a plant's life. Forestry, or a study of the needs and results 

 of forest growth, is most important. The forest should also 

 be considered as a crop, the same as wheat, barley, or any 

 other vegetable growth intended for the use of mankind. 



Forests regulate the flow of streams, by preventing a too 

 rapid run-off of rain water. For the same reason, they cause 

 more water to enter the earth, and there is less erosion of the 

 good land. The decaying leaves and branches produce 

 humus, and thus the soil is enriched where forests remain. 

 More than this, forests prevent high winds, moisten the air, 

 and actually change the climate of a locality to a very marked 



