344 EXPERIMENT STATION EECOKD. 



Production of lumber, lath, and shingles, by States and species, 1906, 



1905, and 1904 {Bur. of the Census [U. S.] ; V. S. Dept. Agi\, Forest 8erv., 

 1907, July 19. folio). — This folder, prepared jointly by the Bureau of the Census 

 of the Department of Commerce and Labor and the Forest Service of the 

 Department of Agriculture, contains tabulated returns from 21.077 mills in 



1906, 11,666 mills in 1905, and 18,277 mills in 1904. 



The use of carbolic acid emulsion in the impregnation of beech ties, R. 

 LoKENZ iCeiitbl. Gesain. Forstic. 33 (1907). Xo. ',. ijp. I.i7-l.',l). — The author 

 has made experiments in the presei'vatiou of wood with different solutions, 

 and is of the opinion that carbolic acid emulsion is not only less costly than 

 tar oil but more effective. His experiments are described in detail. The cost 

 of preserving a beech sleeper of 1 cubic meter with pure carbolic acid is said 

 to be from about 12 to 16 cts., deiJeuding on the percentage of emulsion absorbed, 

 and when introduced under a pressure of from 8 to 10 atmospheres the emul- 

 sion is said to occupy from 25 to 40 per cent of the volume of air-dried ties. 

 When used with larger timber this emulsion is said to penetrate the wood 

 equally as well as watei* or various soluble salt solutions. 



Jamaica timbers, W. Habris {Agr. Xcics [Barbados]. 6 (1907), Xo. 127, p. 

 71). — lu au article to the Jamaica Daihj Telegraph the author suggests the 

 use of local timber supplies in the rebuilding of Kingston, and gives a long list 

 of native timbers suitable for house work, sbingles, wbarf pile.s, etc. 



The staff-tree (Celastrus scandens) as a former food supply of starving 

 Indians, F. T. Dillingham (Amer. yat., J,l (1907), No. J,S6, pp. 391-393). — 

 Reference is made to the use of the staff-tree by some tribes of North American 

 Indians in times of starvation. As a result of recent tests of both the bark and 

 wood, conducted at tbe Bussey Institution of Harvard University, it appears 

 that unlike the bark of most deciduous trees that of the staff-tree contains an 

 abundance of a carbohydrate, known as mannan, to the presence of which is 

 attributed a part at least of its physiologicaT value. 



The longleaf pine in virgin forest, G. F. Schwakz (Neiv York and London, 



1907, pp. 13-5, figs. 23, dgms. 2, map 1). — This book is intended as a contri- 

 bution to the life history of the longleaf pine (Pinus palustris). with the view 

 of presenting some of the most important silvical facts regarding this tree. 

 The work is designed primarily for foresters, forest students, and owners and 

 managers of southern pine timber lands. 



The important phases under consideration are the character of virgin long- 

 leaf pine forests, natural rotation or evolution in the forest, tolerance, fires, 

 the soil cover, injury to seedlings caused by hogs, rate of growth in virgin 

 forest, and forest management. The work concludes with a chapter on the 

 aesthetics of forestry. The text is illustrated with numerous figures and a map 

 showing the general distribution of the longleaf pine. 



Northern limit for spruce, A. W. Graxit ( Skogsviirdsfor, Tidskr.. .5 (1907), 

 No. Jf-5, pp. 217, 21S, fig. 1). — A photographic reproduction and note on a spruce 

 tree, which the author found growing in the Pasvig Valley near Klister Lake, 

 South Varanger, in Russian Lappmark. at 69° 32' 38", and believes to be the 

 northernmost spruce in the world. The tree was about 45 ft. high and 10 to 12 

 in. in diameter, 5 ft. from the ground.- — f. w. woll. 



Investigations on the production of caoutchouc from Manihot glaziovii, 

 A. "Zimmerman (Pfianzer. 3 (1907), So. '/. pp. 49-61). — Tabular results are 

 given of the author's rubber-tapping experiments with Manihot glaziovii in 

 German East Africa, in which various systems of tapping were used, including 

 the " Querring " method, perpendicular stripping, single incisions over large 

 area, and the spiral and V-shape cut methods. The 3 former methods are the 

 most successful thus far. At the end of 1 year's tapping from 9 trees less than 



