646 EXPEEIMENT STATION EECORD. 



botany, forest economy, forest zoology, and forest chemistry. Lists of recent 

 publications and of all publications issued since the institute was established 

 are appended, together with summaries of the projects being conducted and a 

 financial statement for the year. 



Forest seed investig-ations, 1911-12, J. Rafn (Mitt. Dcut. Dendrol. Gesell., 

 No. 22 {1913), pp. 273-280). — Germination tests of both coniferous and decidu- 

 ous species, secured from various countries, are here reported. 



Effect of '^Johannistriebes " upon the formation of annual ring's, H. L. 

 gPATH (Mitt. Dent. Dendrol. Gesell., No. 22 {1913), pp. 118-lU, figs. 20).— 

 A summary of the principal results secured in the author's studies of second 

 growth phenomena (E. S. R., 28, p. 340). 



The cedar (Juniperus virg'iniana) at Stein-Nuremberg-, R. Ferling {Mitt. 

 Deut. Dendrol. Gesell., No. 22 (1913), pp. 84-88, figs. .3).— The author here de- 

 scribes a 35-year-old red cedar plantation of about 15 acres in extent which 

 was set out by L. von Faber to determine the adaptability of the species to 

 German conditions, with special reference to the pencil industry. The growth 

 performance to date appears to warrant the culture of red cedar, both as a 

 forest tree and as an ornamental. 



Rubber tapping experiments, I, A. Zimmermann (Pflanzer, 9 {1913), No. 

 12, pp. 585-597). — This is the first report on some tapping experiments which 

 are being conducted to determine the effect of different tapping intervals and 

 different planting distances on the yield of rubber. 



While no definite conclusions are drawn from the work thus far, the data 

 presented indicate that although relatively higher yields are secured from 

 frequent tapping and close planting these increased yields are secured at a 

 sacrifice to the welfare of the individual trees. As the trees grow older those 

 which are tapped less frequently during the year and are not too closely 

 planted yield the most rubber. 



Pricking or tapping-, F. G. Spring (Agr. Bui. Fed. Malay States, 2 {1914), 

 No. 6, pp. I46-I48). — For the purpose of making a comparison between the 

 pricking and gouge methods of tapping rubber trees 100 4-year-old rubber 

 trees in the Kwala Lumpur Government plantation were selected, 50 trees being 

 tapped with the Northway pricker and 50 trees with a gouge knife. 



The results show in general that, whereas the yield is about the same for 

 either method, the pricking method of tapping is much more expensive and 

 the proportion of expense is apt to increase as the trees increase in girth. 

 Examination of the trees one year after cessation of tapping showed a satis- 

 factory bark renewal on the trees which had been pricked. 



The preparation of plantation rubber, S. Morgan {London, 1913, 2. ed., pp. 

 XII -{-269, pi. 1, figs. 7). — This book, which is offered as a reference work for 

 practical planters, embodies much of the work undertaken on behalf of the 

 Rubber Growers' Association by C. Beadle and Stevens during the first three 

 years after the organization of the Malaya Research Fund. It also contains the 

 work conducted by the author in the Malay Peninsula during that period. 



The subject matter is discussed under the general headings of field opera- 

 tions, factory operations, machinery and buildings, the finished rubber, and 

 general discussions. 



The preservation of wood, A. J. Wallis-Taylor {Jour. Roy. 80c. Arts, 62 

 {1914), No. 3196, pp. 286-315, figs. 12). — A review of our knowledge relative to 

 the various treatments and processes employed in wood preservation. 



About the value of wood-preserving substances containing fluorin, K. 

 Kroemer {Landw. Jalirl., 43 {1912), Ergdnzungst. 1, pp. 173, 175).— A study of 

 the disinfecting properties of silicofluoric acid, zinc silicofluorid, copper silici- 



