650 EXPERIMENT STATION RECORD. [Vol.43 



Resolution 311. It presents the main factors as to timber depletion in the 

 United States, and suggests needed national legislation dealing with the 

 cooperation with States in fire protection and forest renewal, the extension 

 and consolidation of Fc^deral forest holdings, the reforestation of denuded 

 Federal lands, a study of forest taxation and insurance, the survey and classi- 

 fication of forest resources, and current appropriations for forest research. 

 State legislation relating to fire prevention and reforestation of private lands. 

 State and municipal forests, and taxation of forest lands is also reconunended. 



Tree windbreaks as a farm asset, C. G. Bates {Canad. Forestry Jour., 16 

 (1920), No. 6, pp. 280-284, figs. //). — This article deals particularly with the 

 economic importance of windbreaks to the prairie farm. 



Forest and shade trees for planting in Idaho, F. G. Miller (Idaho Sta. 

 Circ. 10 (1920), pp. 4, figs. 3). — This comprises a list of trees offered for sale 

 for planting in the State by the School of Forestry of the University of Idaho, 

 together with brief suggestions for selecting, planting, and caring for trees. 



[Forestry at the North Platte Substation] (Nebraska Sta. Rpt. 1919, pp. 

 25, 26). — A brief statement relative to the condition in 1919 of various trees 

 being tested on the substation grounds. 



The white elm, honey locust, hackberry, and Russian olive have proven to be 

 the best of the more permanent deciduous hardy trees. The conifers, generally 

 speaking, are difficult to start, but the bull pine, jack pine. Black Hills spruce, 

 as well as other varieties, have made a reasonably rapid growth and give 

 promise of great value for windbrakes and ornamentation. The cottonwood 

 and box elder are also desirable for planting on account of their hardiness and 

 fast growth. The wild buffalo berry grows at a fair rate and makes a very ef- 

 fective windbreak. 



Conifers and their characteristics, C. Coltman-Rogers (London: John 

 Murray, 1920, pp. XIII +S33, pis. 4, figs. 7). — Popular descriptive accounts are 

 given of the various conifers, together with identification tables and a glos.sary of 

 botanical terms. 



The establishment of a Douglas fir forest, J. V. Hofmann (Ecology, 1 

 (1920), No. 1, pp. 49-53, fig. 1). — A contribution from the Forest Service of the 

 U. S. Department of Agriculture, continuing a previous paper dealing with a 

 reproduction of Douglas fir (E. S. R., 38, p. 145). 



The author concludes that the measurable characteristics of the Douglas fir. 

 which give it such a prominent place in cedar and hemlock forests, are as 

 follows: The production of heavy crops of seed, which is stored in the forest 

 floor by the indigenous rodents ; the ability of the seed to retain its viability while 

 thus stored and to live through forest fires ; early and quick germination of the 

 seed under favorable conditions; and a rapid development of a long radical. 

 The unfavorable factor is the inability of the Douglas fir to withstand shade, 

 whi(;h results in its elimination from the under story of the forest and conse- 

 quently from the climax forest. It is pointed out that these factors are within 

 the control of man, and must be regulated in order to keep the Pacific North- 

 west region under continuous natural production of this species. 



American pulpwoods: The suitability of various species of American 

 woods for pulp and paper production, O. Kress, S. D. Wells, and V. P. 

 Edwardes (Paper, 24 (1919), No. 21, pp. 15-23).— The data presented in this 

 paper are based upon investigations at the Forest Products Laboratory of the 

 U. S. Department of Agriculture, extending over a period of more than 10 years, 

 relative to the pulp and paper value of various species. The wood of each species 

 is considered with reference to its weight per cubic foot, fiber length, range, com- 



