344 EXPERIMENT STATION RECORD. [Vol.43 



edges of the leaves, they gradually turned brown, curled, but remained on the 

 trees. When the injury appeared in the veins first, a beautiful yellow-colored 

 lace-work seemed to cover the underside of the leaves. 



Quite frequently the trees made an effort to survive by sending forth tiny 

 new branches from latent buds. These small branches in nearly all cases 

 turned lilack-brown and dried out. Most of the ti'ees which were given smaller 

 applications made a secondary growth long before the untreated trees standing 

 nearby. 



"Of the trees experimented with, the maple is the most easily affected by 

 sodium chlorid, followed by the birch and finally by the oaks. The rate of* 

 injury seemed to be dependent upon the height of the trees. The higher trees 

 were more resistant than the lower ones of the same species. It is considered 

 possible that the chlorin increases the acidity in the plant cell, accelerating or 

 harming the vital activities according to the amount employed." 



A list of 38 references to literature bearing on the subject is included. 



Economic trees and their by-products, Mrs. M. Geieve {C'halfont.St. Peter. 

 Bucks: F. Neivbery [1920], pp. 70). — ^A concise account of over 70 species of^ 

 trees that readily gi'ow in Great Britain and which possess valuable by-products, 

 now either neglected or entirely wasted in that country. 



Black locust in Idaho, F. G. Millek (Idaho Sta. Circ. 11 {1920), pp. 4, fig. 

 1). — This circ,ular contains information relative to the range for planting 

 black locust in Idaho, habits, rate of growth, and economic uses of black 

 locust, together with methods of propagation, planting, and care. 



Report on the culture of cinchona trees, G. Phillipe {Rapport sur la 

 Culture des Arhres a Quinquina. Lons-Le-Saunicr : Lucien Declume, 1919, pp. 

 7g). — \ report on investigations conducted in 1900 and 1901 on Ceylon, the 

 British India, and Java, relative to the climatic and soil requirements of the 

 cinchona tree and the cultural practices: best suited to the maximum produc- 

 tion of bai-k with high quinin content in the shortest time. Based upon this, 

 report, consideration is given to the possibility of growing cinchona trees 

 in Annam, Madagascar, and Reunion. 



[Rubber in the French Colonies] (Cong. Agr. Colon. [ParW\, 1918, Compt. 

 Rend. Trav., vol. 3, pp. 316-JfJf3). — Reports are given on the following papers: 

 delivered at the French Congress of Colonial Agriculture, May 21 to 25, 1918: 



Wild and Plantation Rubber in the French Rubber Industry, by A. Dubosc 

 (pp. 316-325) ; The Rubber Industry in Tropical Africa, by Y. Henry (pp. 

 826-339) ; The Status of Rubber on the Ivorr Coast, by Bret (pp. 340-352) ; 

 Rubber in Oubangui-Chari, by Baudon (pp. 353-373) ; The Rubber Extraction 

 Industry in Brazil, by V. Cayla (pp. 374-401) ; and Riibber in Indo China, by 

 O. Dupuy (pp. 402-436) ; the Yields from Hevea Rubber in Madagascar, by 

 Luc (pp. 437^43); ami Herea hrasilicnsls: Methods of Tapping in "thirds" 

 and the Manner of Applying it, by H. Fauconnier. 



The report of the rubber section of the Congress concludes with a list ot 

 works published during the past 50 years on the planting and culture of rubbet: 

 plants, the characteristics of latex, and raw rubber. 



[Rubber in the Uganda Protectorate], L. Hewett et al. {Ann. Rpt. Dept. 

 Agr. Uganda, 1919, pp. 8, 9, H, 15, 21, 24, SO, 3^).— Data are given on cultural 

 and tapping tests, chiefly with Hevea rubber trees on several government 

 plantations in the Uganda Protectorate. 



Lumber and its uses, R. S. Kellogg {'New York: U. P. C. Book Co.. Inc., 

 [1919], 2. ed., rev. and enl., pp. 392, pis. 48, figs. 13).— This is the second re- 

 vised and enlarged edition of this book (E. S. R., 31, p. 840). 



