444 EXPERIMENT STATION RECORD. 



Notes on the tapping of Hevea rubber by the method of paring, R. H. Lock 

 (Circfi. and Ayr. Jour. Roy. Bot. Gard. Ceylon, 6 {1911), No. 2, pq). 17-30, 

 pis, 2). — This circular contains popular information relative to the use of 

 pariiiK systems for tappin.tr Hevea rubber. 



Experiments in tapping Hevea brasiliensis, R. H. Lock (Circs, and Agr. 

 Jour. Roy. Bot. Gard. Ceylon, 5 (1911), No. 18, pp. 231-306, figs. 2).— This 

 comprises the I'esults to date of experiments in tapping old Hevea trees at 

 Henaratgoda since June, 1908. 



Experimental tapping of an old Hevea tree at Henaratgoda, R. H. Lock 

 and M. K. Bamber (Circs, and Agr. Jour. Roy. Bot. Gard. Ceylon, 5 (1911), 

 No. 20, pp. 317-328).- — The tree described is one of the original seedlings sent 

 out from Kew in 1876 and is now in its thirty-fifth year. Betweeu December 

 5, 1908, and January, 1911, the tree vpas tapped 600 times, the average interval 

 between the successive tappings being 1.3 days. 



The total yield of dry rubber for the whole period was 174 lbs., or nearly 

 7 lbs. per montli. It was noticed tliat after the tree had been left untapped 

 for 2 or more days the yield almost invariably rose. Each tapping consisted 

 of a paring with the Bowman-Northway knife, followed by a single application 

 of the sharp pointed pricker. Renewal of bark has been perfect over the whole 

 area tapped. 



Report on the chemical and physical properties of samples of Hevea 

 rubber from Henaratgoda Gardens, R. H. Lock and M. K. Bamber (Circs, 

 and Agr. Jour. Roy. Bot. Gard. Ceylon, 5 (1911), No. 16, pp. 209-216, fig. 1).— 

 In connection witli a study of the effect of different intervals betvv'een successive 

 tappings in Para rubber (Hevea brasiliensis) , samples of the rubber obtained 

 were sent to England to be vulcanized and submitted to manufacturing tests. 

 This circular reports on the analyses and tests and discusses the results obtained. 



On the collection of latex from Manihot glaziovii, A. Zimmermann 

 (Pflanzer, 7 (1911), No. 10, pq). 570-576). — Some experiments conducted on 

 various plantations in the districts of Tanga and Wilhelmstal, German East 

 Africa, are reported. 



Annual report of the director of forestry of the Philippine Islands for 

 the fiscal year ended June 30, 1911, G. P. Ahern (Ann. Rpt. Dir. Forestry 

 P. I., 1911, pp. -'i2, pis. 5). — This comprises a progress report on the work of 

 the divisions of administration and investigation, including statistics relative 

 to the certification of public lands, amounts of important timber species cut, 

 revenues and expenditures, timber licenses in force, utilization of forest prod- 

 ucts, and exports and imports. 



The public forests under tlie charge of the bureau cover 16,000,000 hectares 

 (39,536,000 acres) of land and the value of forest products realized annually 

 is approximately $2,500,000. During the year the total amount of registered 

 private woodlands was increased to 229,622 hectares. 



Progress report of the Forest Research Institute for 1910—11, L. Mercer 

 (Rpt. Forest Research Inst. [Dehra Dun], 1910-11, pp. 28). — This comprises 

 a progress report on the work of the various branches of the Forest Research 

 Institute, including working plans and silviculture, forest botany, forest 

 economy, forest chemistry, and forest zoology. 



A list to date is given of all forest publications issued by the institute. 



Forest products of Canada, 1910.— Pulpwood, H. R. MacMillan, B. Robert- 

 son, and W. G. H. Boyck (Dept. Int. Canada, Forestry Branch Bui. 26, 1911, 

 pp. IJ,. figs. 2).— Statistical data are given for 1910 showing the quantity, 

 value, and kinds of pulpwood consumed by the Canadian mills, including also 

 the processes used. The amount exported is also indicated. Comparative 

 data are given for 1909. The 51 mills reporting used 598,487 cords of wood in 



