1916] FORESTRY. 147 



the status of New York vegetation under cultural conditions. A map showing 

 the dominant trees in different sections of the State is appended. 



The evergreens of Colorado, B. O. Longyeae (Fort Collins: State, 1914, pp. 

 80, tigs. 58). — This publication contains popular descriptions of the native ever- 

 greens of Colorado and also discusses the uses of evergreens, both from an 

 ornamental and economic standpoint; methods of propagation and culture; 

 and insect pests and diseases. 



Qualities and uses of the woods of Ohio, W. R. Lazendy (Ohio State Univ. 

 Bui., 20 (1916), No. 9, pp. 75-111, figs. 18).— In this paper the author reports 

 studies relative to the structure and physical properties of woods taken from 

 Ohio trees. Tabular data show the weight of the various woods in pounds 

 per cubic foot and in kilograms per cubic decimeter. 



Tests were made of GO samples representing 62 species of hardwoods with 

 the view of determining the relative rapidity of absorption and the amount of 

 moisture absorbed by air-dried samples of Ohio woods, and the results are pre- 

 sented in tabular form and discussed. The data given show the weight in 

 grams of water absorbed in seven days, as well as the original volume in cubic 

 centimeters and the amount and percentage of increase in weight and volume. 



Similar data are also presented on tests conducted with eight coniferous 

 species of Ohio. 



The paper concludes %vith an account of the kinds and quantities of woods 

 used in Ohio and a classification of the principal and minor uses of various 

 Ohio woods, as well as a list of useful products from wood and parts of 

 trees. 



Durability of timbers, P. Groom {Trans. Roy. Scot. Arbor. Soc, 30 (1916), 

 pt. 1, pp. 4Jf-Jf6). — An examination of the statistics dealing with the durability 

 of various European and Indian timbers led the author to conclude that the 

 color of the heartwood is no safe guide to the durability of wood. Although 

 the most perishable woods appear generally to be light-colored, there are dark- 

 colored woods which are by no means durable and some light-colored woods 

 of exceeding durability. The present observations are in opposition to Mayr's 

 law which states in substance that the more intense the color of the heartwood 

 of timber the more dui'able it is. 



Wood as building material, G. Lang {Das Hols als Baustoff. Wiesbaden: 

 C. W. Kreidels, 1915, pp. XXI-\-3S8, pis. 2, figs. 2U).—A manual of information 

 relative to the growth, structure, physical properties, and uses of the more im- 

 portant woods. 



Pointers on m^arketing woodlot products, S. L. Wolfe {U. S. Dept. Agr. 

 Yearbook 1915, pp. 121-130, pis. ^). — In this paper the author offers a number 

 of suggestions aimed to assist the farmer in securing the maximum returns from 

 his woodlot. 



Volume tables for timber estimating, T. Johnson {Massatabeller for 

 Trdduppskattning. Stockholm: Zetterlund & Tlielanders, 1915, 3. ed., pp. 96, 

 figs. 3). — This comprises tables for estimating the contents of logs and standing 

 timber. 



Success of aeroplane patrols, F. B. IMoody {Canad. Forestry Jour., 12 {1916), 

 No. 4r PP- -^71, 472). — This note calls attention to the successful use of the aero- 

 plane in detecting forest fires during the fire season of 191-5 in Wisconsin. 



Forest protection in Canada, 1913—14, C. Leavitt, C. D. Howe, J. H. White, 

 ET AL. {Toronto: Coin. Conserv. Canada, 1915, pp. XIV+317, pis. 31, figs. 6). — 

 This report comprises a compilation of information dealing with forest pro- 

 tection in Canada collected under the direction of the committee on forests dur- 

 ing the years 1913-14. 



