544 EXPERIMENT STATION EECORD. [Vol.38 



British forestry, past and future, W. Someeville {London and New York: 

 Humphrey Mil ford, [1911/], pp. 19). — In this paper the author discusses various 

 factors tending to make British forestry unprofita])le in the past, shows the 

 present need for afforestation, and suggests methods of procedure. 



Forestation practice in Norway {Jour. Forestry, 16 {1918), No. 1, pp. 90- 

 99). — A summary of forestation practice in Norway based on Lindberg's worli 

 on the culture of pine trees in Norway (E. S. R., 33, p. 542). 



The trees at Mount Vernon, C S. Sargent {Reprint from Ann. Rpt. Mount 

 Vernon Ladies' Assoc, of the Union, 1911, pp. 16, pi. 1). — A record, with plant- 

 ing plan, of the size and condition of the trees planted by Washington near his 

 house at Mount Vernon, and of those now standing which have been planted or 

 have sprung up natunilly in the neighborhood of the mansion since his death 

 in 1799. 



Tree growth in the vicinity of Grinnell, Iowa, H. S. Conard {Jour. For- 

 estry, 16 {1918), No. 1, pp. 100-106).- — This paper presents some accurate data 

 on tree growth in Poweshiek, Jasper, and Mahaska Counties, Iowa. 



The data show in a general way that the richer upland prairie soils of Iowa 

 are very favorable for tree growth. Growth increment is great enough for the 

 production of timber as a crop on these soils. On the other hand, the capital 

 value has not yet made the timber crop the equal of corn. 



Oregon forest facts {Salem, Oreg.: State Bd. Forestry, [1911], pp. 8). — A 

 brief review of Oregon's timber resources and what State and private activity 

 in forest protection has accomplished. 



Firewarden's handbook; Oregon forest fire laws {Salem, Oreg.: State Bd. 

 Forestry, 1916, pp. ^S).— This handbook indicates briefly the forest policy of 

 the State and supplies the information needed by the State firewardens in the 

 discharge of their duties. 



Our present knowledge of the forest formations of the Isthmus of Panama, 

 H. PiTTiER {Jour. Forestry, 16 {1918), No. 1, pp. 16-8^). — A paper on this sub- 

 ject read before the Biological Society of Washington, November 18, 1916. It 

 comprises a brief account of some results of the study of the flora of Panama 

 made in connection with a general biological survey organized by the Smith- 

 sonian Institution. 



Forestry handbook. — II, Some of the principal commercial trees of New 

 South Wales, .J. H. Maiden {Sydney: Govt., 1911, pp. 22J,, pis. 83).— In con- 

 tinuation of part 1 of this handbook, which discussed forest principles and 

 practice (E. S. R., 35, p. 346), the present part contains descriptive accounts 

 of some of the principal commercial trees of New South Wales. The species 

 are considered with reference to their nomenclature, distinguishing charac- 

 teristics, character and use of the wood and other products, habitat, and 

 methods of propagation. The descriptions are accompanied by plates illustrat- 

 ing the twigs, fruits, buds, etc., and a reference list of accessible illustrations 

 of trees and shrubs of New South Wales forests is also included. 



Probable error in field experimentation with Hevea, O. F. Bishop, J. 

 Grantham, and M. D. Knapp {Arch. Riibbercult. Nederland. Indie, 1 {1911), 

 No. 5, pp. 385-366, fig. i).— This has been noted from another source (E. S. R., 

 37, p. 837). 



Results of tapping experiments with Hevea brasiliensis, A. W. K. de Jong 

 (Arch. Rubbercult. Nederland. Indie, 1 {1911), No. 5, pp. 318-^02). — A sum- 

 marized accmmt of the present knowledge on the tapping of Hevea trees. 



The suitability of latexometers for determining the rubber content of 

 latex in field tests, A. A. L. Rutgers and J. G. J. A. Maas {Meded. Alg. Proef- 

 stat. Alg. Ver. Rubberjylanters Oostkust Sumatra, Rubber Ser., No 3-4 {1911), 

 pp. l-2If). — In view of the contention supported by various writers that 



