140 EXPEEIMENT STATION EECORD. 



FORESTRY. 



Trees and shrubs, edited by C. S. Sargent (Boston and New York, 1911, 

 vol. 2, lit. 3, pp. 117-189, pis. 25). — This is the seventh installment of a work 

 which consists of a series of plates, accompanied by brief descriptions of new 

 or little known trees and shrubs of the northern hemisphere which may be 

 expected to flourish in the gardens of the United States and Europe and those 

 of special economic interest. The work has been prepared with the assistance 

 of a number of specialists and the material has been derived largely from the 

 living collections and from the herbarium of the Arnold Arboretum. 



Each part contains 25 plates and a volume consists of 4 parts. Part 1 of 

 volume 1 was issued in 1902. The succeeding parts have appeared from time 

 to time. 



Trees and how to know them, W. A. Lambeth (Atlanta, Oa., Richmond, 

 Va., and Dallas, Tew., 1911, pp. 52, figs. ^8). — A brief practical manual with 

 analytical and dichotomous keys of the principal forest trees of the South. 



Trees and forestry, Mary C. Dickerson (Amer. 31 us. Nat. Hist. Guide Leaflet 

 32, 1910, pp. lOff, pi. 1, figs. 77, dgm. 1). — An elementary treatment of the sub- 

 ject based on the Jesup collection of North American woods in the American 

 Museum of Natural History. 



The distribution of woody plants in the Pike's Peak region, E. C. Schnei- 

 der (Colo. Col. Pub., Sci. Ser., 12 (1909), No. 6, pp. 137-169, map i).— The 

 object of this paper Is to present a picture of the associations of the woody 

 plants that may be valuable to students of mountain distribution. One hun- 

 dred and fifteen species are recorded. The associations of the woody plants are 

 grouped into 12 difl:erent classes according to their habitat. 



Studies on the soil improvement faculty of our important timber species, 

 R. Wallenbock (Centhl. Gesam. Forstw., 37 (1911), No. 10, pp. J^l,l-J^5&).~ 

 The author's soil investigations in mixed stands of oak and beech (E. S. R., 2.S. 

 p. 146) wex'e extended to include a number of stands of fir, spruce, pine, and 

 larch. 



As indicated by the water capacity of the soils in weight percentage, beech 

 soils showed the best physical texture. The water capacity of soils in fir, 

 spruce, oak, larch, and pine stands averaged 9.5, 95, 84, 81, and 79 per cent, 

 respectively, of the water capacity of beech soils. The difference in water 

 capacity between the soils of the shade-tolerant group, beech, fir, and spruce, 

 and the light-demanding group, oak, larch, and pine, was from 3 to 4 times 

 greater than the differences between the hardwood and coniferous species in 

 each group. 



The author concludes that the advantageous action of the hardwood foliage 

 may be restricted largely to loam soils, whereas the sparser material of the 

 coniferous trees, particularly the pine needles, is of most advantage on coarse- 

 grained, sandy soils. 



Recent developments from the experiments with foreign species of wood 

 in Prussia, Schwappach (Ztsclir. Forst u. Jagdw., Ji3 (1911'), Nos. S, pp. 

 591-611; 10, pp. 757-782). — This comprises the observations and results from 

 cultural experiments with foreign timber species which were started in Prussia 

 about 30 years ago. Consideration is given to about 45 different species. The 

 statistics of the experimental areas are presented in tabular form. 



The cubic content and form of the pine in Sweden, A. Maass (Skogs- 

 vdfdsfor. Tidskr., 1911, Faclcafd., No. 6, pp. 209-257, figs. 2).— Tables for com- 

 puting timber in standing pine trees of different sizes are given on the basis of 

 measurements of 1,869 trees made by the author in forests in different parts of 

 Sweden. 



