50 EXPERIMENT STATION EECOED. 



lbs. of ties, 17,125 lbs. of posts, and 4,450 lbs. of stove wood, as compared with 

 10,145 lbs. of ties, 16,190 lbs. of posts, and 6,125 lbs. of stove wood from 

 91 6-yeai'-old trees. 



Some preliminaiy investigations with regard to the cultivation of the 

 black locust in southeastern Indiana, G. Culbektson (Ann. Rpt. Ind. Bd. 

 Forestry, 14 {1914), pp. 67-72, figs. 5). — Preliminary observations on several 

 locust plantings in southeastern Indiana led the author to conclude that many 

 thousand acres of hill lands rich in lime and subject to serious loss by erosion 

 should be planted to locust trees, and that the profits from such plantings 

 would prove highly satisfactory. 



Rubber in Brazil, O. Labeoy and V. Cayla (A Borracha no Brazil. Rio de 

 Janeiro: Min. Agr., Indus, e Com., 191S, pp. V+15S-\-XX, pis. 38, figs. 52).— A 

 report on the exploration, preparation, marketing, and commerce of various 

 forms of Brazilian wild rubber, together with an account of methods employed 

 in the culture, tapping, and preparation of plantation rubbers in tropical Asia. 

 The introductory part contains economic considerations on the world's pro- 

 duction of rubber and summarizes the various sources of rubber. The suc- 

 ceeding parts deal with Hevea, Manihot, Castilla, and Hancoruia rubbers. 



International Hubber Congress and Exhibition, Batavia, September, 

 1914. — Bubber Book, edited by C. J. J. van Hall {International Ruhher Con- 

 gres met Tentoonstelling, Batavia, 191Jf. Rubber Recueil, Amsterdam: J. H. de 

 Bussy [1915'\, pp. X-\-609, pis. 5, figs. 70). — This work, which was prepared on 

 behalf of the congress committee, comprises a series of papers by various 

 authorities on the rubber-producing plants, their culture, the preparation of 

 raw rubber, and commerce. The various articles are grouped under the 

 general headings of botany and phytopathology, climate and soil, cultivation 

 and tapping, preparation and chemistry of rubber, economic questions, and 

 commerce. 



Chinese forest trees and timber supply, N. Shaw {London: T. Fisher Vn- 

 wvn, 191Jf, pp. 351, pis. 34)- — Part 1 of this work takes up the physical and 

 climatic conditions in China, contains a general description of the forests, and 

 discusses the forest problem of China. Part 2 contains notes on broad-leaved 

 trees, conifers, bamboo, palms, and foreign trees with reference to their range, 

 adaptation, and economic uses. Information relative to rafting operations and 

 timber imports into China and notes on timber in use by Chinese railways 

 are appended. 



Production and value of Irish timber, A. C. Forbes (Dept. Agr. and Tech. 

 Instr. Ireland Jour., 15 {1915), No. 2, pp. 338-346);.— A statistical survey of 

 Ireland's timber resources with special reference to the uses and markets for 

 native timbers. 



Of the total area of the country only 297,809 acres, or 1.4 per cent, is under 

 woods. The rates of cutting and of planting during the past 10 years show 

 a deficiency of 4,341 acres in the planted area necessary to maintain a 

 pei-manently stocked acreage of woodland. 



Manuring experiments on Castleton Estate, Telok Anson, M. Barrowcliff, 

 B. Bunting, and F. G. Spring {Agr. Bui. Fed. Malay States, 3 {1914), No. 3, 

 pp. 1 11-114). — In 1913 experiments were started with some 3,500 3-year-old 

 rubber trees to determine the possible value of nitrogen, potash, and phos- 

 phoric acid used alone and in various combinations in stimulating growth and 

 yield. Growth measurements for the first season as here presented show no 

 decided influence from the various treatments. The experiments are to be 

 continued. 



