FORESTRY. 243 



Report on rubber-yielding plants of French Guinea, A. Chevalier (BuJ. 

 Off. Colon. [France], 2 {1909), No. 18, pp. 5J,5-557).—A brief report on the 

 present status of wild rubber exploitation and on the artificial plantings being 

 developed in French Guinea, including information relative to the rubber-yield- 

 ing species, methods of harvesting and coagulating the latex, and the prepara- 

 tion of rubber for the trade. The author concludes that the rubber-yielding 

 species of East Africa are too dissimilar to make possible the unification of the 

 various grades of rubber produced. 



Rubber production on the Ivory Coast (Bid. Off. Colon. \ France], 2 (1909), 

 Xo. 19. pp. 577-500). — A report on this subject, discussing the extent of produc- 

 tion, rubbcir-yielding species, harvesting, and methods of coagulating the latex, 

 .counnercial grades of rubber, and market conditions. 



Rubber and gutta-percha in New Guinea. Warburg {VerJiandl. Kolnn. 

 WirtscJiaftl. Kom., 1909, No. 2, pp. S.'f-Jf.)). — A brief report on the present status 

 of the rubber industry in the German colonies, with special reference to New 

 Guinea. 



Wood preservation in the United States, W. F. Sherkesee ( F. S. Dept. Agr., 

 Forest 8crv. Bill. 78, pp. 31, pis. .'/, figs. 3). — The purpose of this bulletin is 

 to discuss briefly but completely the general principles of wood preservation 

 and its status in tlie United States to-day. General consideration is given to 

 the nature of decay, methods of retarding it, and the preservatives and processes 

 in use. These processes are then discussed in detail, including the various 

 pressure and nonpressure processes, the low-pressure process, and superficial 

 treatments, such as the brush method and dliii)iug. The effect of ti'eatment on 

 the strength of tiuiber, au<l the national value of wood pi'eservation are also 

 considered. 



The estimated total annual destruction of cut timber in the United States is 

 given at 9,607.340 M ft., b. m. The estimated reduction in annual cut which 

 would ensue from a projier preservative treatment of all timber from decay is 

 given as 5,9.50,195 M ft., b. m. The estimated annual financial saving by proper 

 preservative treatment is $71,780,000. 



Forest products of the United States, 1908 (Bur. of the Census [U. S.], 

 Forest J'rodiicts 10, pp. 137, tlgins. ,i). — This bulletin contains statistical data 

 compiled by the Bureau of the Census in cooperation with the Forest Service 

 of this Department relative to the production of lumber, lath, and shingles, the 

 cross-ties purchased, the consumption of pulp wood, tan bark and tanning ex- 

 tracts, the production of slack and tight cooperage stock, luimht'r of poles pur- 

 chased, wood consumed in veneer manufacture, wood distillation, pine distilla- 

 tion, and exports of forest products in 1908. 



The total value of forest i)roducts of the United States in 1908 was estimated 

 to have been $1,050,000,000, a decrease of nearly 18 per cent from the value in 

 1907. This decrease is attributed chiefly to the business depression. 



Foreign trade of the United States in forest products, 1851-1908 (f^ 8. 

 Dept. Agr., Bur. Statis. Bui. 51, pp. 32). — This consists of a compilation of the 

 statistics of the imports and exports of forest products in the foreign trade of 

 the United States for the period 1851-1908, the data being secured from reports 

 of the Bureau of Statistics, Department of Commei-ce and Labor. The value of 

 domestic forest products exported from the United States increased from an 

 annual average of $6,000,000 in 1851-1855 to $.59,000,000 in 1901-1905. The in- 

 crease in the value of forest products imported for the corresponding j^eriods 

 was from $2,000,000 to $72,000,000. The highest values given are for 1907, 

 when $92,948,705 worth of forest products was exported, and $122,420,776 worth 

 was imported. 



