1919] FORESTRY. 839 



The development of a brush-disposal policy for the yellow-pine forests of 

 the Southwest, H. II. Chapman (Jour. Forestry, 11 {1V19), No. 6, pp. 693- 

 702). — The author enumerates the factors that should be given consideration in 

 formulating a practical brush-disposal policy, reviews previous brush-disposal 

 practices employed, and presents the standard instructions for brush disposal 

 on the National Forests of New Mexico and Arizona for yellow pine and Doug- 

 las fir types, except on Coconino and Tusayan forests. The article also includes 

 Comments on Brush Disposal in the Southwestern District, by G. A. Pearson. 



Making best use of idle lands in KTew York, J. W. Stephen (2V. y. State 

 Col. Forestry, Syracuse Univ., Circ. 19 {1919), pp. 53, figs. 18). — This circular 

 contains concise information on the starting and care of woodlands. 



What is potential forest land? C. Hoar (Jour. Forestry, 11 (1919), No. 6, pp. 

 650^56). — The author tentatively defines potential forest land as "land suit- 

 able tor the growth of tree species in stands . . . under natural conditions 

 or such artificial conditions as are economically practicable." The policy pur- 

 sued in eliminating lands from and adding lands to the National Forests is dis- 

 cussed, and more thorough investigation of various factors influencing land 

 classification is advocated, with the view of securing definite knowledge relative 

 to potential forest land. 



The segregation of farm from forest land, P. S. Lovejoy (Jour. Forestry, 

 11 (1919), No. 6, pp. 621-6Jt6).—The author attributes the failure to secure the 

 development of a rational forest policy for the lands now waste and idle 

 largely to the assumption that there is an inherent conflict between the forest 

 and farm. He discusses the fallibility of this assumption, points out the im- 

 portance of forestry to farming, critically reviews present methods of land 

 classification, and advocates a comprehensive survey for separating forest from 

 farm land that shall embrace topographic, geologic, geographic, agronomic, 

 forest, and economic work. 



New Indian species of forest importance, B. L. Gupta (Indian Forester, Jf5 

 (1919), No. 1, pp. 388-392). — A list is given of 48 new Indian species of forest 

 importance, showing their distribution. 



Indian species of Carissa, H. H. Haines (Indian Forester, 45 (1919), No. 1, 

 pp. 315-388, pis. 4)- — Descriptive notes with a key are given of the Indian 

 species of Carissa, which yield Karaunda bark and Karaunda leaves, im- 

 portant sources of tannin. 



Cultivation and tapping of Castilla rubber in the Philippines, V. C. Aldaba 

 (Philippine Ayr.. 1 (1919), No. 9-10, pp. 21Jt-301).—K contribution from the 

 Philippine Experiment Station, comprising a study of the Castilla rubber indus- 

 try in the I'hilippines, and based both on the author's practical experience and 

 on available literature. 



Consideration is given to the history, botany, and geographic distribution of 

 Castilla. methods of culture, factors determining methods of culture, local 

 method of culture, pests and diseases, seed bearing habit, light requirement 

 and growth, variation in yield, improvement by selection, relation of planting 

 distance to yield, tapping operations, and equipment. The text is accompanied 

 by growth and yield data based upon measurements and tapping experiments 

 conducted in local plantations, and the author presents conclusions relative to 

 the best method of growing and tapping Castilla trees. 



The distribution of walnut, W, H. Lamb (Hardwood Rcc, 47 (1919), No. 2, 

 pp. 21, 22). — The great demand for American black walnut wood created by 

 the war has caused special attention to be focused on this cabinet wood, and 

 has led to many attempts to bring in substitutes which frequently have little 

 merit because character and physical properties are lacking or because the 

 158071°— No. 9—20 i 



