FORESTRY. 443 



Canadian volume tables, E. Wilson {Forestry Qimrt., 9 (1911), No. If, pp. 

 v89-59-'i ) . — Volume tables are given for white spruce, black spruce, balsam, and 

 white pine. The tables are based on measurements made throughout the valley 

 of the St. Maurice River, Quebec. 



Strength, values for structural timbers, M. Cline (U. S. Dept. Agr., Forest 

 Serv. Circ. 189, pp. 8). — This circular contains in condensed form the average 

 structural values resulting from a large number of tests made by the Forest 

 Service on the principal structural timbers of the United States. The tables 

 given show the results of bending, compression, and shear tests on green mate- 

 rial and on air-seasoned material. 



A list is given of the Forest Service publications in which parts of the data 

 have previously appeared. 



The Yale transplanting board, J. W. Toumey (Forestry Quart., 9 (1911), 

 No. Jf, pp. 539-543, pis. 2, figs. 3). — A board for transplanting forest seedlings, 

 which has been used for 4 seasons at the Tale Forest School and to a certain 

 extent by various state foresters and by others in the eastern United States, is 

 here illustrated and described. This implement is believed to be superior to 

 others tested, both from the standpoints of rapidity and of uniform planting. 



Variation in time of nutrient absorption among forest trees and its 

 practical importance in fertilization and silviculture, E. Ramann (Ztschr. 

 Forst u. Jagdw., 43 (1911), No. 10, pp. 747-7J7). — In a previous investigation 

 of Bauer, briefly noted (E. S. R., 25, p. 27), it was found that there was a varia- 

 tion in the time of absori^tion of the principal inorganic fertilizers by different 

 species. With the data secured from this work as a basis, the author here 

 presents tables showing the time of the year in which the principal fertilizer 

 elements are absorbed by spruce, pine, lai'ch, and fir seedlings. Similar data 

 are also given for the nitrogen abson)tion by the beech and oak. The jiossible 

 application of these data in the fertilization of forest trees and in the develop- 

 ment of pure and mixed stands is discussed. 



On some experiments with mountain pine, E. Zederbauer (Cenfbl. Oesam. 

 Forstw., 31 (1911), No. 7, pp. 297-310).— Ahout 1885 a large number of trees of 

 the French mountain pine (Piniis tincinnata) were planted experimentally in 

 vai'ious situations and soils in the Austrian Alps. Tabular data secured in 

 1909 are given showing the growth behavior of these trees under different condi- 

 tions, some of the trees having been started from seed and others from young 

 plants. The most significant observation made was that the trees growing 

 nearest to the region of natural distribution of this species made the best growth. 



The experiments indicated that the mountain pine is worthy of cultivation 

 within its region of natural occurrence. 



Regeneration of spruce in high altitudes, A. Schaeffer (Bui. Soc. Forest. 

 Franchc-Comt^ et Bel fort, 11 (1911), No. 4, pp. 292-300).— A discussion of the 

 regeneration of sjoruce in the alpine regions in which consideration is given to 

 climate, soil, stand, and method of treatment. 



Results of rubber tapping at the experiment station, Peradeniya, during 

 1910—11, IM. K. Bambek and J. A. Holmes (Circs, and Agr. Jour. Roy. Bot. 

 Gard. Ceylon, 5 (1911), No. 19, pp. 307-316). — Comparative results secured from 

 the use of different methods of trapping are given. 



Rubber tapping experiments, A. E. Collens (Ann. Rpt. Dept. Agr, Trinidad 

 and Tobago, 1910-11, pp. 65-73). — Experiments in tapping and coagulating the 

 latex of various rubber trees, including Hevea spp., CastiUa elastica, Manihot 

 glaziovii, and others are reported. The author devised a simple method, herein 

 described, of coagulating and smoking Castilla and other rubber which has 

 produced some fine samples. 



