586 HOW DOES MAN CONSERVE HIS RESOURCES? 



schools, and other buildings should be shown. Conventional signs 

 for different kinds of trees may be used and a key attached to the map. 

 Where the tree is not recognized, a reference book should be taken into 

 the field and the tree identified. The list of reference books at the 

 end of the unit will give you some of the best books likely to be found 

 in a school or public library. It would be well to prepare with your 

 report specimens of leaves, buds, twigs, fruits, and flowers, if obtain- 

 able. If the survey is made in winter, then winter twigs might be 

 shown. 



Practical Exercise 4. Write a paragraph for your workbook on the best 

 methods of reforestation in your locality. If you live in the city, discuss tree 

 protection in streets and parks. 



Practical Exercise 5. Get information from any sources you can on the 

 extent and location of national forest preserves within the boundaries of your 

 state. Also the state parks or forest preserves. Make a map of the state and 

 locate all the above. If you have been to a national park or forest preserve, 

 tell about the work of the forest rangers there. 



A city's need of trees. The city of Paris, well known as one 

 of the most beautiful of European capitals, spends over $100,000 

 annually in caring for and replacing some of its 90,000 trees. All 

 over the United States municipal governments are beginning to 

 realize what European cities have long known, that trees are of 

 great value to a city. For, besides being beautiful, trees protect 

 the streets and buildings from the direct rays of the sun. The 

 growth of trees along the street and in front of houses increases 

 the value of the property. For these reasons, cities are planting 

 trees and protecting them. Many cities have appointed city 

 foresters who care for the trees in the parks and along the streets. 

 Many municipalities plant trees and tax the property owners who 

 receive benefit thereby, for trees and shrubs have an ornamental 

 value that can be expressed in dollars and cents. Perhaps the 

 most hopeful sign is that people everywhere are beginning to 

 realize the value of our trees and the need for their protection and 

 conservation. 



Tree surgery. Another sign of the appreciation of our trees, 

 especially in cities, is found in the work of the tree surgeon. Just 

 as a dentist takes out decayed material from a tooth and protects 

 the tooth by placing within it an antiseptic filling, so tree surgeons 

 take out rotted parts of a living tree, clean it with antiseptic solu- 

 tions, and fill the cavity with cement or other durable substances. 

 When a large limb is cut off, the cut portion is treated with an 



