116 OUR FORESTS 



(9) Trees furnish resting places and shelter for birds. 



(10) Trees 'increase the value of real estate. 



(11) Trees protect the pavement from the heat of the sun. 



(12) Trees counteract adverse conditions of city life. 



Let us all try to make Arbor Day what it should be, a day for 

 caring for and planting trees, for thus we may preserve this most 

 important heritage of our nation. 



Reference Books 



elementary 



Hunter, Laboratory Problems in Civic Biology. American Book Company. 

 Mayne and Hatch, High School Agriculture. American Book Company. 

 Murrill, Shade Trees, Bui. 205, Cornell University Agricultural Experiment Station. 

 Pinchot, A Primer of Forestry, Division of Forestry, U. S. Department of Agri- 

 culture. 



ADVANCED 



Apgar, Trees of the United States, Chaps. II, V, VI. American Book Company. 

 Coulter, Barnes, and Cowles, A Textbook of Botany, Part I and Vol. II. American 



Book Company. 

 Goebel, Organography of Plants, Part V. Clarendon Press. 

 Strasburger, Noll, Schenck, and Karston, A Textbook of Botany. The Macmillan 



Company. 

 Ward, Timber and Some of its Diseases. The Macmillan Company. 

 Yearbook, U.S. Department of Agriculture, Division of Forestry, Buls. 7, 10, 13, 



16, 17, 18, 20, 26, 27. 



