144 EXPERIMENT STATION RECORD. 



Investigations of mixed stands, Schwappach (Ztschi: Forst u. Jagdw., 

 Jjl {1909), No. 5, pp. 313-332). — The details, including tabular data and conclu- 

 sions reached, are given of investigations conducted bj' the author in East 

 Prussia and Silesia relative to the growth behavior of mixed forest stands in 

 comparison to that of pure stands, the determination of the influence of mixed 

 stands upon the soil condition, and a study of methods of developing and man- 

 aging mixed stands. 



Forest flora of the Berar Circle, D. O. Witt (Nagpiir: Govi., 1908, pp. VII+ 

 103). — This consists of a descriptive list of trees, shrubs and climbers, and other 

 plants of the Berar Circle, especially those of economic importance in times of 

 scarcity and famine. The species are grouped under their respective families 

 and the scientific as well as the vernacular names when known are given. Spe- 

 cial care has been taken to indicate characteristics readily noticeable in the 

 field, and the lesser known species are described with considerable detail, al- 

 though technical terms have been avoided so far as possible. 



Notes on Sal in Bengal, A. L. McIntire ([Indian Forest Dept.] Pamphlet 

 5, Sylvicult. /S'cr. 1, pp. 1-16). — This consists of popular notes on the distribu- 

 tion, culture, and uses of Sal (Shorea robusta), which is the principal forest 

 tree in Bengal, and occurs in greater or lesser abundance in all parts of that 

 country. 



Tapping experiments with Kickxia elastica in Kamerun, A. Shulte 

 (Guiiimi Ztg., 23 {1909), Nos. 28, pp. 877-880;, 29, pp. 91Ji-916).— In confirmation 

 of the work reported by Strunk in 1906 (E. S. R., 17, p. 980) the author found 

 the perpendicular slit method of tapping to be superior to the herringbone 

 method for the Kickxia rubber tree, but not so well adapted for tapping Hevea. 

 Just how far apart these perpendicular slits should be spaced, and the length 

 of time which should elapse before the second tai»iiing is made in order to se- 

 cure the best results both as to yield and the health of the tree, were not de- 

 termined, although it appears that the Kickxia can not be tapped so frequently 

 as the Hevea. Yields from individual Hevea trees are greater than from 

 Kickxia trees, but the latter can be planted closer. 



Exports and imports of forest products, 1908, A. H. Pierson {U. S. Dept. 

 Agr., Forest Serv. Circ. 162, pp. 29). — Summarized and detailed tables are given 

 for 1908 relative to the exports and imports of forest products, including both 

 raw and manufactured material of various kinds, together with sununarized 

 tables on the exports and imports of forest products for the years 1904-1908, 

 inclusive, and other data. The data are derived for the most part from the 

 annual report of the Bureau of Statistics of the Department of Commerce and 

 Labor, entitled Foreign Commerce and Navigation of the United States for the 

 year ending June 30, 1908. 



DISEASES OF PLANTS. 



Notes on plant diseases in 1908, W. .T. Morse {Maine ^fa. Bui. IGJ,, pp. 28, 

 pis. 2, chart 1). — In connection with the regular lines of investigation, the 

 pathologist of the station has given some attention to a number of minor prob- 

 lems, which are briefly reported upon. These include potato diseases, orchard 

 tree diseases, development of scab on limed potato soils, self-boiled lime-sulphur 

 as a substitute for Bordeaux mi.xture for apple scab, weather records in relation 

 to winter injury of fruit trees, crotch injury of apple trees, and winter injury 

 of white pine. 



The potato disease causing the most trouble was the early blight {Alternaria 

 solani), very little of the late blight being observed even on unsprayed fields. 

 Both the blackleg and Fusarium disease have appeared in Maine, but neither 

 is as yet widely distributed. 



