444 EXPERIMENT STATION RECORD. 



whole a historical review of the balata industry in Surinam. Part 2 contains a 

 discussion relative to the distribution of balata-yieldiug trees, methods of tap- 

 ping the trees, and coagulating the latex, as well as a general account of the in- 

 dustry. Part 3 discusses the chemistry, falsification, and uses of balata. 



New facts on the Bleekrodea tonkinensis, Dubabd and Ebekhakdt (Bui. 

 Econ. Indo-Chine, n. ser., 11 {1908), No. 7^, pp. 520-522).— As a result of recent 

 observations relative to this new species of rubber tree (B. S. R., 20, p. 152), 

 which is locally known in Tonkin as Teo-Nong, the authors find that it extends 

 over a much larger area than first supposed. Its geographic distribution in North 

 Indo-China, together with the influence of the seasons and temperature on the 

 flow of its latex, is here discussed. 



Rubber from Southern India (Bui. Imp. Inst, 7 {1909), No. 2, pp. 163-166).— 

 Analyses are reported of samples of rubber prepared from Ceara, Castilloa, and 

 Para trees growing in the government experimental gardens at Kullar and Bur- 

 liar in the Nilgiri Hills. 



Trees of commerce, W. Stevenson {London, 1908, rev. ed., pp. XII-{-27.'f). — 

 This work, which is largely a condensation of the information on commercial 

 trees contained in the scattered literature on the subject, first appeared in 1894, 

 The present edition has been revised to include more recent information. All of 

 the commercially important hardwoods are considered relative to their distin- 

 guishing characteristics, geography, commercial distribution, and the properties 

 and uses of their timber. 



The timber supply of the United States, R, S. Kellogg {U. S. Dept. Agr., 

 Forest Serv. Circ. 166, pp. 2Jt, figs. 6). — This circular discusses the extent of our 

 forest resources, their ownership, the rate at which they are being cut, and the 

 outlook for the future timber supjily. Approximate estiruates are given of the 

 original and present forest areas and stands, together with stumpage estimates 

 of the principal species and the statistics of the cut and value of lumber and 

 other forest products, the data being drawn from various Government and out- 

 side sources. The original forest area is esitmated at about 856,600,000 acres or 

 about 45 per cent of the total land area of this country, whereas the present 

 forest area is estimated at about 544,250,000 acres or about 29 p6r cent of our 

 total land area. 



Forest products of the United States, 1907 {Bur. of the Census [U. 8.], 

 Forest Products 10, pp. 122, dgms. 3). — 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, number of poles pur- 

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

 tion, and exports of forest products in 1907. 



The total value of products taken from the forests of the United States during 

 the calendar year 1907 approximates $1,280,000,000 in value at the point of pro- 

 duction. This is an increase of $80,000,000 over the corresponding total for 1906, 

 but the increase appears to be due more to a greater valuation of products rather 

 than to a greater production in 1907. 



Practical assistance to owners of forest land and to tree planters {TJ. 8. 

 Dept. Agr., Forest Serv. Circ. 165, pp. 7). —This circular combines and super- 

 sedes Circulars 21 and 22 of the same series (B. S. R., 10, p. 443; 11, p. 745). 

 It discusses the aims and nature of assistance given and contains the regulations 

 governing cooperation with private owners, together with sample application 

 forms. 



The wood commerce of the Saxon railroads in the years 1883-1907, inclu- 

 sive, F. Mammen {8achs. Holzverkehr u. HoWiundel EinzeldarsteU., 1909, pt. 1, 



