FORESTRY. 843 



Reproduction of lodgepole pine in relation to its management, N. C. Beown 

 {Forestry Quart., 10 (1912), A'o. 1, pp. 17-23, pi. 1).—A paper on this subject 

 based on data secured on the National Forests of southwestern Montana. 



Yield tables for pine, A. Maass (Skogsvdrdsfdr. Tidskr., 1911, Fackafd., 

 No. 12, irp. 375-422, figs. 13; Meddel. Stat. Skogsforsoksanst. (Mitt. Forstl. Vers. 

 Anst. ScJnccdcns), 1911, No. 8, pp. 197-2.',. ',, figs. i3).— Yield tables for pine 

 constructed by the author are given and discussed. 



The red beech: Economic and statistical investigations of the forest divi- 

 sion, Eberswalde Forest Research Station, A. Schwappacii (Die Rotbuche: 

 WirtschaftlicJic und statische Untersuchungen der forstlichen Abteilung dcr 

 Hauptstation des forstlichen Versuchsicesens in Ebersicalde. Neudamm, 1911, 

 pp. YI+2S1, pis. 7). — Part 1 of this report comprises the statistical results of 

 long-continued investigations relative to the influence of various degrees of 

 thinning and of crown density on increment development of beech stands. The 

 author points out that the data as a whole serve to show the need and utility of 

 combining statistical investigations with silvicultural research. 



Part 2 contains yield tables based on data secured from pure beech stands, 

 which have been under investigation for the past 30 years. Part 3 reports a 

 study relative to the revenue-yielding capacity of beech forests. The appendix 

 contains caliperiug tables both for thinning and yield-experimental areas. 



A similar study of the pine has been previously noted (E. S. R., 20, p. 644). 



The host plants of the sandal tree, M, Rama (Indian Forest Rec., 2 (1910). 

 No. If, pp. 159-207, pis. 8).' — This embraces the results of a study of the host 

 plants of the sandal tree (Santahim album) undertaken to ascertain which 

 species of plants the tree likes best and which of them help to produce the 

 largest quantity and the best quality of scented wood. 



After having presented evidence of the complete dependence of the sandal 

 tree on other species of plants for its nourishment, the author outlines the 

 nature of the investigations ; enumerates the different species of plants, the 

 roots of which were found to have been attacked by sandal roots, including a 

 brief description of the extent and nature of the attack, etc. ;, and points out 

 the association of the sandal with other species, the roots of which have not 

 yet been examined. No definite conclusion has been drawn thus far as to the 

 best host plants for the sandal tree. 



A list of associates of the sandal tree in its natural habitat and elsewhere is 

 appended. 



Vitality of rubber seed, F. G. Spring (Agr. Bui. Straits and Fed. Malay 

 States, 3. ser., 1 (1912), No. 2, pp. 1-4). — A test made of the vitality of seeds 

 from tapped and untapped Hevea rubber trees shows that the seeds from un- 

 tapped trees averaged 50 per cent higher in germination than those from tapped 

 trees. Tapping appears to lessen the weight and size of the seeds, as well as to 

 reduce their germinating power. It is concluded that seeds intended for export 

 should be selected from untapped trees. 



A large number of seeds were coated, respectively, with beeswax, hard paraffin, 

 and vaseline to determine the preserving effects of these substances. Seeds 

 coated with beeswax showed an increased germination of about 30 per cent 

 over the uncoated seeds. Seeds coated with hard paraffin gave better results 

 than untreated seeds, but not so good as those coated with beeswax. The seeds 

 treated with vaseline did not germinate. In no case was there apparent a large 

 falling off in germinating power from the third to the tenth week. 



Rubber (Rev. Econ. Internal., 9 (1912), I, No. 2, pp. 227-350) .—A symposium 

 containing the following articles relating to the rubber industry : Rubber Yield- 

 ing Species, by E. De Wildeman (pp. 239-258) ; Rubber Culture, by P. Van 

 Romburgh (pp. 259-275) ; The Financial Evolution of the Rubber Industry, by 



