10 DEPARTMENT BULLETIN 863, U. S. DEPT. OF AGRICULTURE. 



forest trees arc profitable: (1) Poor soils. (2) Steep slopes. (3) 

 Eroding soils. (4) Rocky land. (5) Wet land. (6) Unused cor- 

 ners or waste places. 



Extent of woodlands in the locality : Proportion of crop land and 

 woodland. The total acres of woods on 10 to 20 representative farms 

 in the locality. 



Practical exercises. — From the data gathered in the survey con- 

 struct a chart showing the proportion of crop land and woodland, 

 the total crop acreage and the total woodland acreage. Study the 

 places where you find trees growing and list such locations as in- 

 dicated in topics for study. What type of trees do you find com- 

 monly growing in each of these localities? What farms could profit- 

 ably plant forest trees ? What sort of trees should be planted in 

 case a young forest is established ? 



Correlations. — Drawing: Draw a map of a farm or of the school 

 district, locating the poor soils, steep slopes, eroding soils, rocky 

 land, wet land, unused corners or waste land, and mark on this map 

 the names of the trees that grow on these places or that could be 

 profitably grown thereon. 



Language: Write a report' showing the advantages of using the 

 poor soils and waste lands for tree planting, giving examples from 

 the farms of the district if possible. 



Arithmetic: Problems showing comparative acreage of crop land 

 and woodland, and percentages of each, will be suggested in the 

 study of this lesson. 



Lesson III. ECONOMIC VALUE OF THE FOREST. 



Problem. — To learn the value of a forest as conserver of soil 

 moisture, as protection against soil erosion, as a shelter against ex- 

 tremes of temperature, and as a means of increasing the farm income. 



Sources of information. — Farmers' Bulletins 358, 715, 745, 788, 

 1071, and 1117; Department Bulletin 481; Yearbook Separate 688; 

 Forestry Misc. F-I. 



Illustrative material. — The best illustrative material will be found 

 in a field trip to the woods and field. Actual examples of the use of 

 the trees can be pointed out. If a field trip is not practicable, illus- 

 trations may be clipped from papers and magazines showing the 

 erosion on unprotected hillsides and the use of trees as shelters in 

 pastures and about the farm buildings. 



Topics for study. — With an acquaintance formed with the different 

 species of trees, it will be worth while to learn their value both as in- 

 dividual trees and associated together in woodlands. 



Timber or wood products. Trees, grouped according to their value 

 for wood or timber. (This is expanded in Lesson IV.) 



