191S] DISEASES OF PLANTS. 349 



State College of Forestry at Axton, N. Y. The present condition of the differ- 

 ent forest plantations is also briefly noted. 



Report of the director of forestry for the year 1916, R. H. Campbell et al. 

 {Deijt. Int. Canada, Rpt. Dir. Forestry (IDIG), pp. 95, figs. 26). — The report in- 

 cludes a review of the several lines of work conducted by the forestry branch 

 during the year and detailed reports of the work of the tree-planting division 

 and on the forest reserves in tl-K separate Provinces, together with the report 

 of the Forest Products Laboratory of Canada. 



[Report on] forestry (Ann. Rpt. Reforms and Prog. Chosen (Korea) {1915- 

 16), pp. 129-134, Pl- !)• — A progress report on forest activities in Chosen during 

 the year ended March 31, 1916, discussing forest protection, forest surveys, 

 experimental afforestation, nursery work, and Arbor Day planting. Since 

 April 3, 1911, the first Arbor Day, some 56.200,000 trees have been planted, es- 

 pecially by school children. 



State ownership of forest lands, P. T. Coolidge {Jour. Forestry, 15 {1917), 

 No. 8, pp. 951-973). — A discussion of State ownership of forest lands as a gov- 

 ernmental policy. 



Instructions for making timber surveys in the National Forests, including 

 standard classification of forest types {U. S. Dept. Agr., Forest Serv. {1917), 

 pp. 53). — The purpose of this handbook is to present the policy of the Forest 

 Service for the conduct of timber surveys and to standardize the methods used 

 in the districts to the extent necessary to insure reasonably accurate and uni- 

 form results. 



Alnus oregona: Its value as a forest type on the Siuslaw National Forest, 

 H. M. Johnson {Jour. Forestry, 15 {1917), No. 8, pp. 981-987).— A discussion 

 of the red alder {A. oregona) with reference to its silvical characteristics and 

 value as a nurse crop for Douglas fir, as a soil builder, for fire protection to 

 second growth and reproduction, and its commercial value. 



Rubber cultivation in Trinidad and Tobago, N. Lamont et al. {Bui. Dept. 

 Agr. Trinidad and Tobago, 16 {1917), No. 3, pp. 95-127).— A report of a special 

 committee of the Trinidad Board of Agriculture relative to the present status 

 and future prospects of rubber cultivation in Trinidad and Tobago, including 

 suggestions relative to cultural practices and the development of efficient tap- 

 ping methods and uniform plantation methods of preparing rul^ber. 



Rubber culture in the Philippines, P. J. Wester {Philippine Agr. Rev. [Fng- 

 lish Ed.], 10 {1917), No. S, pp. 201-220, pis. 4, figs. 2).— The author reviews the 

 present status of the plantation rubber industry, discusses the Philippines as a 

 possible future source of rubber, and gives directions for the culture, harvest- 

 ing, and preparation of Para rubber. 



DISEASES OF PLANTS. 



Problems of plant pathology, F. L. Stevens (Bot. Gas., 63 {1917). No. 4, pp. 

 297-306). — This paper, dealing mainly with plant pathology as primarily an 

 economic subject and referring also to the relations between science and patho- 

 logical practice, offers suggestions regarding the classification of fungus plant 

 diseases. 



The dissemination of parasitic fungi and international legislation, E. J. 

 Butler {Mem. Dept. Agr. India, Bot. Ser., 9 {1917), No. 1, pp. 73). — This paper 

 has for its primary object a discussion of the means by which parasites are able 

 to cross oceans or tracts having only plants unsuitable to their spread. The 

 principal means include birds, air movements, and commercial transportation 

 of products. Control of the dissemination of diseases is discussed according to 

 the cases in which the disease has already succeeded in gaining a foothold in 



