1917] EXPEEIMENT STATION EECORD. 345 



FORESTRY. 



The economic woods of Hawaii, V. MacCaughey {Forestry Quart., 14 (,1916), 



No. 4, pp. 696-716). — In this paper the author outlines the chief ecologic zones 

 of Hawaii and gives a descriptive account of the more important economic 

 trees with reference to their distribution and character of tree and wood. 



The uses of Formosan trees, R. Kanehiba (Indian Forester, Jf2 {1916), No. 

 S, pp. 410-420). — The author here presents a classified list of Formosan trees 

 based upon their uses. 



Investigations on the assortment ratios of spruce, silver fir, and beech, 

 P. Flury {Mitt. Schweiz. Centralanst. Forstl. Versuchsio., 11 {1916), No. 2, pp. 

 153-212, figs.. 3). — This comprises a series of timber estimating tables for indi- 

 vidual trees and for entire stands of spruce, silver fir, and beech. Tables are 

 also given showing the percentage distribution of wood-volume in pure even- 

 aged and normal-stocked stands at the ages of 20, 40, 60, 80, 100, and 120 

 years, respectively. Introductory considerations deal with principles and sys- 

 tems for estimating timber and explain the application of the tables. 



Influence of the intensity of thinnings on the yield of young regular 

 stands of fir, E. Mer {Rev. Eaux et Forets, 54 {1916), Nos. 7, pp. 185-191; 11, 

 pp. 305-309). — The author gives the results of thinning experiments ' in some 

 selected fir stands, the actual thinning operations having been started in 1899. 

 The results in general confirm those secured in thinning experiments with 

 young spruce stands (E. S. R., 35, p. 241), indicating that both early and rela- 

 tively heavy thinnings act advantageously on future yield. 



Douglas fir fiber, with special reference to length, H. N. Lee and E. M, 

 Smith {Forestry Quart., 14 {1916), No. 4, pp. 671-695, pi. 1, figs. 11).— This 

 study, which was conducted under the direction of the Forest Products Labora- 

 tories of Canada, deals in most part with length values of Douglas fir fibers as 

 observed in different parts of the same tree and also in different trees. A 

 bibliography of cited literature dealing with fiber measurement studies is 

 included. 



Some characteristics of slash pine, W. R. Mattoon {Forestry Quart., 14 

 {1916), No. 4y PP- 578-5S8, pis. 2, figs. 2). — A brief discussion of some character- 

 istics of slash pine, with special reference to its rapid spread in second-growth 

 forests, silvicultural qualities, wood structure, and commercial value of young 

 stands. 



Seeding of Hevea at different altitudes on Gunong Angsi, F. G. Spring 

 {Agr. Bill. Fed. Malay States, 5 {1916), No. 1, p. 3). — In continuation of pre- 

 vious observations showing that the growth of the tree and yield of rubber are 

 poor at a comparatively high altitude (E. S. R., 30, p. .53.5), the au.thor here 

 presents data showing that seed production is similarly affected. At about 

 1,000 ft. the yield of seed commenced to fall off, at 1,800 ft. only a few seeds 

 were produced, while at 2,400 ft. there was no evidence of fruiting. 



Ecology of sal (Shorea robusta). — II, Seedling reproduction in natural 

 forests and its improvement, R. S. Hole and Puban Singh {Indian Forest 

 Rec, 5 {1916), No. ^, pp. II -{-43-85, pis. 9). — This is the second contribution on 

 the study of the causes of the dying back of sal seedlings (E. S. R., 32, p. 144). 

 The present paper gives the results of experiments conducted during the period 

 1912 to 1915 in which sal seedlings were grown in different localities in the 

 shady forests and in the open, respectively. The development of the seedlings 

 was watched throughout the year, and as far as possible the chief factors op- 

 erative at the season when death or bad growth was noticed were determined. 



