FORESTRY. 47 



vol. 1, pp. IX+21S, figs. 9). — A treatise ou the preparation aud development of 

 forest worliing plans with reference to their application in forestry in the 

 United States. A bibliography of literature on forest regulation is included, 

 and a brief review of the treatment of forest regulation by some of the leading 

 German authorities is appended. 



Acts of assembly relating to forests and forestry, edited by J. Kalbfus 

 (In Digest of the Game, Fish, and Forestry Laws, 1913. Harrishurg, Penn.: 

 State, 1913, pp. 237-300). — The text is here given of all the acts passed by the 

 Pennsylvania Assembly through the year 1913 relating to forests aud forestry. 



Torest administration, in the colonies (Bibliothdque Colon. Internal., Inst. 

 Colon. Internat., Bruxelles, 11. ser., 1914, 'vols. 1, pp. 551; 2, pp. 516; 8, pp. 

 505). — This comprises a symposium dealing with the forest laws and forest 

 administration in the colonies of Great Britain, Holland, Germany, Italy, and 

 France, the Philippines, Hawaii, Porto Rico, etc. The subject matter was 

 prepared by various authorities. 



A review of the net revenues from the Saxony state forests for the year 

 1912, VOGEL (Tharand. Forstl. Jahrh., 65 (1914), No. 3, pp. 196-210).— This is 

 the usual statistical review for the year 1912 relative to the yield in lumber 

 and minor forest products, receipts, expenditures, and net returns from the 

 state forests in the various districts of Saxony. 



The influence of soil strata in drifting sand in the vicinity of Darmstadt 

 upon the growth of forest trees, W. Schottler {Notizbl. Vcr. Erdk. Darm- 

 stadt, If. ser.. No. 34 {1913), pp. 51-11). — An analytical study of several types 

 of soil in the drifting sand region about Darmstadt, with special reference to 

 the occurrence and growth of various kinds of trees. 



A fertilizer experiment in forest nurseries, P. von Ru§nov {Mitt. Forstl. 

 Versuchsic. Osterr., N.o. 38 {1914), pp. 56-64). — The results are given of a coop- 

 erative fertilizer test conducted in a number of forest nurseries in Austria. 

 The work as a whole indicates that phosphatic fertilizers have had practically 

 no influence on the growth of spruce and pine seedlings. 



A thinning experiment with Douglas fir (Pseudotsuga taxifolia), A. 

 KuBELKA {Mitt. Forstl. Versuchsw. Osterr., No. 38 {1914), PP- 9-34, figs. 8). — 

 Growth data are given for a Douglas fir stand which was thinned in 1905, when 

 18 years old, and again in 1910. 



Timbers from various countries {Bui. Imp. Inst. [So. Kensington], 12 

 {1914), No. 3, pp. 360-370, fig. 1). — Data are given on the working qualities 

 and mechanical tests of several timber species from parts of Africa and from 

 British Guiana. 



Density of wood substance and porosity of wood, F. Dunlap {U. S. Dept. 

 Agr., Jour. Agr. Research, 2 {1914), No. 6, pp. 423-428). — The investigation, the 

 results of which are here presented in tabular form, was made to determine 

 the density of the lignocellulose which makes up the walls of the cells of which 

 wood is composed as a basis for calculating the porosity of wood. The woods 

 tested included longleaf pine, Douglas fir. Pacific yew, mockernut, beech, red 

 oak, and sugar maple. The experimental methods are described. 



Although the range in density of wood substance for the seven species tested 

 was nearly 4i per cent, it is concluded that for practical purposes this density 

 may be considered uniform, with a value of 1.54. Since most commercial 

 woods have a density between 0.3 and 0.6 it appears that the unoccupied space 

 in a block of wood may be from four-fifths to two-fifths of its volume. 



The application of these results to the calculation of porosity of crossties is 

 illustrated with data previously secured in the preservative treatment of red 

 oak ties (E. S. R., 20, p. 344). 



