846 EXPEBIMENT STATION EECOKD. 



The woodsman's handbook, H. S. Graves and E. A. Ziegler (J7. /S. Dept. 

 Agr., Forest Serv. Bill. 36, rev., pp. 208, figs. 16). — The present edition of this 

 bulletin (E. S. R., 14, p. 576) has been revised and enlarged, taking the place 

 of the proposed second part of the former bulletin and including both parts in 

 one publication. The work as a whole comprises a collection of tables and rules 

 of practical use to lumbermen, foresters, and others interested in the measure- 

 ment of wood and timber. A summary of growth investigations is also 

 included. 



The Bradley bibliography, II. — Dendrology, Part II, A. Rehder {Cam- 

 bridge, Mass., 1912, vol. 2, pp. F///+926).— The present volume of the Bradley- 

 Bibliography (E. S. R., 26, p. 240) aims to contain the titles of all publications 

 relating to families, genera, and species, together with references to descrip- 

 tions, notes, and illustrations of woody plants contained in articles published 

 in periodicals and serials and in smaller publications or in books dealing with 

 subjects foreign to taxonomy where they are often apt to be overlooked. 



Silvical leaflets (C7. S. Dept. Agr., Forest Serv. Silv. Leaflets 45, pp. 6; 

 51-53, pp. i each.) — Four numbers of series of leaflets, each dealing with the 

 range and occurrence, climate, associated species, habit, soil and moisture, 

 tolerance, growth and longevity, susceptibility to injury, reproduction, utiliza- 

 tion, and management of one of the following species of trees in the order corre- 

 siDonding to the leaflet numbers above: Western hemlock (Tsuga heterophylla) , 

 broadleaf maple {Acer macrophyllum), Oregon oak {Qxiercus garryuna), and 

 red alder {Alruis oregona). 



Mechanical properties of redwood, A. L. Heim {TJ. S. Dept. Agr., Forest 

 Serv. Circ. 193, pp. 32, figs. S). — This circular presents the results of one of 

 the series of tests which the Forest Service has been making to determine the 

 mechanical properties of the commercial woods of the United States (E. S. R., 

 25, p. 342; 26, p. 443). The tests here reported were conducted in cooperation 

 with the universities of California and Washington. 



The test material was divided into 2 classes, the first of which included 

 stringers and joists containing defects similar to those present in timber pur- 

 chased on the market. Tbis material was tested to secure strength values for 

 use in design, to find out whether there were differences in strength values of 

 timber from different localities, and to determine the influence of seasoning 

 and defects on the strength of commercial-sized timbers. The second class, 

 made up of small, clear, straight-grained specimens cut from the uninjured por- 

 tions of the tested stringers and joists, was tested to study the effects on their 

 strength of the rate of growth, of the proportion of summerwood, and of the 

 weight. Four kinds of tests were made to show strength in bending, in compres- 

 sion parallel to grain, in compression perpendicular to grain, and in resistance 

 to shearing. The data secured in each of these tests are tabulated and discussed. 



In conclusion the redwood lumber manufacturers' rules for grading are com- 

 pared with a set of tentative grading rules for structural timbers prepared by 

 the Forest Service. 



The absorption of creosote by the cell walls of wood, C. H. Teesdale 

 (U. 8. Dept. Agr., Forest Serv. Circ. 200, pp. 7, fig. 1). — Tests recently eon- 

 ducted by the Forest Products Laboratory and here tabulated and discussed 

 show that a decided swelling takes place in wood impregnated with creosote. 

 This swelling is caused by the absorption of the creosote by the cell walls. The 

 average increases in volume resulting from the treatments of yew heartwood, 

 yew sapwood, hemlock heartwood, and hard maple heartwood in percentage of 

 the volumes before treatment were 6.81, 10.7, 7.3. and 8.14, respectively. 



Condition of experimental chestnut poles in the Warren-Buffalo and 

 Poughkeepsie-Newton Square lines after five and eight years' service, C. P. 



