FORESTKY. 141 



A note on some statistical and other information regarding the teak 

 forests of Burma, R. S. Tkoup (Indian Forest Rec, 3 {1911), No. 1, pp. 11+ 

 73, pis. 8). — The object of this paper is to present in convenient form informa- 

 tion gleaned from worliiug plan operations in the teak forests of Burma. 



The successive chapters discuss the distribution of teak and the area of teak 

 forests in Burma, the chief types of teak forest, statistics regarding the grow- 

 ing stock and yield of various teak forests, the rate of growth and exploitable 

 age of teak, and the yield and outtui'n of teak forests in Burma. A map of 

 Burma showing the teak forests under working plans in 1910 is appended. 



Cultural experiments with the yew (Taxus baccata), A. Burckhardt 

 (Foi-stiv. CentU., n. ser., 33 {1911), No. 8-9, pp. Ji57-I,6S) .—The author calls 

 attention to the importance of the yew as a forest tree and reviews the liter- 

 ature on cultural experiments with this species. 



Variability of plantation Para rubber, V. Catxa {Jour. Agr. Trap., 11 

 {1911), No. 123, pp. 266-270) .—The author calls attention to the great varia- 

 bility of cultivated Para rubber and points out the important causes of the 

 variability which occur previous to and during coagulation and after coagulat- 

 ing the latex. 



A new coagulant for Manihot glaziovii, A. Zimmermann {Pflanzer, 7 

 {1911), No. 9, pp. Ji99, 500). — During the course of experiments conducted in 

 Amani, the author found that the addition of a 1 per cent solution of cal- 

 cium chlorid to the latex of the rubber tree M. glaziovii resulted in a fairly 

 good coagulation. A 1^ per cent solution of calcium chlorid is considered suffi- 

 cient to bring about complete coagulation at the end of the rainy period 

 when the latex is especially fluid. The use of calcium chlorid reduces the cost 

 of the coagulent considerably without injuring the elasticity and nerve of the 

 rubber. 



Barium chlorid, magnesium chlorid, and magnesium sulphate all proved to 

 be rather strong coagulents but were not so active as calcium chlorid. 



The forest resources, E. M. Griffith {Rpt. Conserv. Oom. Wis., 1911, pp. 

 43-50). — This comprises a concise statement of the forest resources of Wis- 

 consin with recommendations bearing on their conservation. 



Report of the forestry department for the year ended June 30, 1910, 

 E. D. Hay {Rpt. Forestry Dept. N. S. Wales, 1910, pp. 12, pis. i^).— This is the 

 usual report relative to forest areas and routine operations, including a 

 financial statement for the year and data on imports and exports of timber. 

 An outline is given of experiments in timber physics which are now' under way. 

 A paper dealing with reforestation in the Tropics with special reference to 

 eucalypts is appended. 



Photogrammetry and its importance for forestry, R. Hugershoff ( Tharand. 

 Forstl. Jahrb., 62 {1911), No. 1, pp. 123-132, figs. S).— The author points out 

 and illustrates a number of ways in which photogrammetry may be applied in 

 forestry. 



Single seed selection, G. F. S. Elliot {Jour. Roy. Hort. Soc. [London], 37 

 {1911), No. 1, pp. 1-8). — The author cites evidence secured by different inves- 

 tigators to show that with various plants, and especially with trees, there is 

 a distinct advantage in selecting the largest and finest seeds for stock. 



A brief bibliography is appended. 



On the influence of incorrect dimension determinations upon the content 

 of logs, A. ScHiFFEL (CeiitN. Gesam. Forstic, 37 {1911), No. 8-9, pp. 371- 

 390, figs. 4). — The author describes practical methods for determining the 

 errors in caliper measurements, shows the effect of these errors on the log 

 content, and discusses the application and use of a several factor cubic formula 

 as a means of diminishing the percentage of error. 



