NATURAL ENEMIES OF THE FOREST. 249 



THE NATURAL ENEMIES OF THE FOREST. 

 REFERENCES : * 



( 1 ) Meterological. 



Pinchot, Primer I, pp. 75-76. Bruncken, pp. 27-29. 

 Roth, First Book, pp. 198- 

 202. 



Water. 



Roth, First Book, p. 27. 



Snow, ice and frost. 



Pinchot, Primer, I, p. 70. Bruce, For. and 2rr., 8: 159, Ap. '02. 



(2) Vegetable. 



Roth, First Book, p. 4. Sherfesee. For. Circ. No. 139. 



Boulger, pp. 70-75. von Schrenck, Bur. Plant Ind. Bull. 



Spaulding, For. Bull., No. 22. No. 36. 



Ward, Chaps. V, VI, VII. von Schrenck, Bur. Plant Ind. Bull. 



Sickles, pp. 41-45. No. 32. 



von Schrenck, For. Bull., No. von Schrenck, Agric. Yr. Bk., 1900, 



41, PL III. p. 199. 



(3) Animal. 

 Grazing. 



Pinchot, Primer I, pp. 69- Coville, For. Bull. No. 15, pp. 28-31. 



73, II, p. 73. 

 Pinchot, Agric. Yr. Bk., 1898, Roth, First Bk., p. 130, 178. 



p. 187. 



Insects. 



Comstock, passim. Hopkins, Agric. Yr. Bk., 1903, pp. 



Hopkins, Agric. Yr. Bk., 313-328. 



1902, pp. 265-282. Hopkins, Agric. Yr. Bk., 1904, pp. 



Roth. First Book, pp. 115- 382-389, Figs. 43-56. 



130. Pinchot, Primer, I, p. 73. 



Howard, Entom. Bull., No. Felt, N. Y. State Museum Bull., 



11, n. s. 103, Ent. 25. 

 Hopkins, Spaulding, Entom. Hopkins, Entom. Bull. No. 32. 



Bull, No. 28. Hopkins, Entom. Bull. No. 56. 



Hopkins, Entom. Bull., No. Hopkins, Entom. Bull. No. 58. 



48. Spaulding and Chittenden, For. 



Bull. No. 22, pp. 55-61. 



*For general bibliography, see p. 4. 



