FOEESTRY. 151 



insect agency. Bees may prove valuable agents in assisting the work of setting 

 a good seed crop, although isolation of different colors of flowers may be neces- 

 sary if the stock is required to remain perfectly true. A number of insects 

 which visit the Spencer peas are briefly discussed. 



The application of refrigeration to the retarding of plants and the pres- 

 ervation of flowers, L. C. Coebett {Cold Storage and Ice Trade Jour., /,0 

 (1910), No. 4, PI). 32-34).— A paper read at the Second International Congress 

 of Refrigeration, Vienna, 1910. The following phases are discussed : Types of 

 structure used for retarding purposes, holding nursery stock from one season 

 to another, classes of nursery stock which will permit of storage in retarding 

 houses, and cold storage in floriculture. 



FOEESTRY. 



The forest, B. E. Fernow (La Foret. Quebec, 1906, pp. 1J,9, pis. 2/,).— This 

 consists of a series of lectures on the principles of silviculture, delivered at the 

 School of Mineralogy, Kingston, Ontario, in January, 1903. 



Selection forests, M. Wernick (Allg. Forst u. Jagd Ztg., 86 (1910), July, 

 pp. 229-235; Aug., pp. 269-273, pis. 2; Sept., pp. 313-321; Oct., pp. 353-360).— A 

 detailed study of the adaptation of the selection or single tree method of forest 

 management to the sm.all private wood lot, including a discussion of results 

 secured from experimental stands. The general conclusion is reached that the 

 selection system is well adapted for the development and maintenance of the 

 small wood lot. 



Distribution and utilization of the mangrove swamps of Malaya, F. W. 

 FoxwoRTHY (Ann. Jard. Bot. Buitenzorg, 1910, Sup. 3, pt. 1, pp. 319-344, tnap 

 1). — The author briefly considers the occurrence of mangrove swamps within 

 the principal divisions of the Malayan region and gives a table of distribution 

 and a key to the mangrove swamp species, together with notes on the distribu- 

 tion, common names, chief uses, and special characteristics of the different 

 species making up these swamps. 



Plantation rubber in Cochin China, P. Morange (Bui. Econ. Indo-Chine, 

 n. ser., 13 (1910), No. 8//. irp. 331-346).— A general report by the chief of the 

 Agricultural Service in Cochin China on the various rubber plantations and 

 the conditions affecting rubber culture in that country. Although a number 

 of rubber species have been tested, thus far Para rubber (Hevea brasiliensis) 

 alone has proved successful. 



Relation between the composition of the latex of Hevea brasiliensis and 

 the tapping process, W. R. Tromp de Haas (Ann. Jard. Bot. Buitenzorg, 1910, 

 Sup. 3, pt. 1, pp. 443-446) .—Two methods of tapping were compared, namely, 

 V-shaped incisions and double herring-bone incisions. The latex was analyzed 

 during different periods of the tapping to determine any variation in its com- 

 position. 



The results, which are presented in tabular form, lead to the conclusion that 

 as the tapping period advances the quantity of solid material in the latex 

 diminishes, whereas the noncombustible matter and the nitrogenous matter 

 increases. The V-shaped method of incision gave a slightly higher rubber 

 content. 



The growing of guayule in relation to the soil, J. E. Kirk wood (Amcr. 

 Rev. Trap. Ag-r., 1 (1910), No. 5-6, pp. 142-158, pis. 10).— In continuation of 

 propagation studies (E. S. R., 2.3, p. 543), the results are given of an experi 

 mental study of the guayule rubber plant in its relation to the physical and 

 chemical conditions existing in the soil where it grows spontaneously and of the 

 effects of different soils on the plant as to its form, structure, and rate of 



