542 EXPERIMENT STATION EECOED. 



both jack piue aud hemlock may be advantageously used, either singly or in 

 various combinations, at least in the cheaper grades of paper. 



Note on the antiseptic treatment of Pinus excelsa and P. longifolia sleep- 

 ers with Avenarius carbolineum oil at Jagadhari, R. S. Pearson {Indian 

 Forester. 38 {1912), No. 7, i)p. 32!)-*332)i — The method and results of treatment 

 of over 700 railroad ties with A. carholinemn oil is described in detail. 



Harvesting' and preparation of balata in French Guiana, Y. Boucher {Bui. 

 Off. Colon. [France], 5 {1012), Xo. 55, pp. 209-213). — A short descriptive 

 account. 



Hevea brasiliensis or Para rubber, H. Wright {London and Ceylon, 1912, .}. 

 ed., pp. XX+5Jf2, pis. 39, figs. 25). — This work treats of the botany, cultivation, 

 £hemistry, and diseases of Para rubber. The successive chapters discuss the 

 history of Para rubber and of rubber plantations; botanical sources of rubber; 

 climatic conditions and rate of growth of Hevea trasiUensis ; planting opera- 

 tions and methods of cultivation ; cultivation of catch and intercrops; HeAea 

 rubber soils and manuring; tapping operations and implements; how, where, 

 and when to tap; methods in vogue on notable estates; effects of tapping; tap- 

 ping and yields in the Amazon region, Malaya, Ceylon, South India, Dutch East 

 Indies, Borneo, Africa, etc.; general considerations affecting yields; physical 

 and chemical properties of latex ; production of rubber from latex ; the theory 

 of coagulation ; purification of rubber and washing machines ; the drying and 

 smoking of rubber ; forms, branding, packing, handling, characters, and com- 

 parative value of plantation rubber; chemical and physical properties and test- 

 ing of rubber ; manufacture and composition of rubber articles : properties, uses, 

 and distribution of seeds ; diseases and pests of Hevea rubber trees ; costs of 

 production on estates; and estimated costs of planting in the middle east. 



The influence of light on the quality of oak wood in the high-forest of the 

 Vosges, P. Galland {Rev. Eaur ct Forets, 51 {1912), No. 15, pp. -'/.55--'/6V/ ) . — ^A 

 study of oak forests in the Yosges leads the author to conclude that when oak 

 trees are subjected to much greater light conditions than those under which they 

 have been developed, they deteriorate in value to such an extent that where 

 they occur in regeneration areas they should be removed befoie the work of 

 regeneration is commenced. The ideal light condition for an oak forest is one 

 in which the top of the tree is in open sunlight and the base In shade. 



Establishment of mixed stands of spruce and beech as well as of pine 

 and beech as the best means of avoiding the dangers which threaten pure 

 stands of conifers, and for the improvement of the soil, D. Tiemann {Forstw. 

 Centhl., n. ser., 3^ {1912), Nos. 6, pp. 297-309; 7, pp. 3-'t5-353) .^In this article 

 the author advocates the growing of spruce and pine in mixtures with beech in 

 order to lessen such dangers as storms, snow, fire, and insect attacks which 

 often do serious injuiy to pure stands of spruce and pine. The importance of 

 mixed stands as a means of soil improvement is also discussed. 



Winterkilling of evergreens, C Y. Nash {Jour. N. Y. Bot. Gard., 13 {1912), 

 No. 151, pp. 110-120). — A large number of both coniferous aud broad-leaved 

 evergreens are listed and discussed relative to their behavior during the severe 

 winter of 1911-12. 



Forest conditions in Indiana, S. Coulter {Proc. Ind. Acad. Sei., 1909, pp. 

 If47—'i62). — This comprises a study of forest conditions in Indiana, including 

 recommendations relative to the maintenance of an adequate timber supply in 

 the State. 



Tree planting by farmers. C. R. Tillotson {U. S. Dept. Agr. Yearbook 1911, 

 pp. 257-268, pis. 3). — This article discusses briefly, for the region east of 

 Nebraska and north of Tennessee and North Carolina, the best trees to plant, 

 the methods to be followed in planting them, and the products they yield. 



