44 EXPERIMENT STATION RECORD. 



Part 1 of this study treats in detail of tlie preparation and industrial value of 

 different grades of raw Para, rubber. Part 2 deals with the culture and ex- 

 I)loitation of Para rubber in the Malayan Peninsula, in Java, and in Ceylon. 



On the anatomy of Eevea brasiliensis and Manihot glaziovii with refer- 

 ence to tapping, P. Arens (Meded. Proefstat. Malang, 191\1, No. 1, pp. 3-11, 

 figs. 5). — A short descriptive account. 



An irrigation method for tapping- Hevea, T. Wurth {Meded. Proefstat. 

 M along, 1011, No. 1, pp. 15-lS, figs. 2). — A method of providing a small but 

 constant supply of water to the tapping incisions is described and illustrated. 



[Tapping experiments] (Ann. Rpt. Agr. Dcpt. South. Nigeria, 1910, pp. 

 9-l.'i, 3.'i-36, 39). — Experimental tappings of Ceara and Para rubber trees made 

 at different points in Southern Nigeria are reported. 



On the coagulation of the latexes of some Euphorbias, A. Zimmermann 

 yPflanzer, 7 (1911), No. 12, pp. 7-'/2-74^). — The latexes of a number of Euphor- 

 bias were successfully coagulated with a, 1 or 2 i>er cent solution of tannin. 



On heath burning for reforestation, E. Wibeck (lleddel. Stat. Skogsfor- 

 soksanst. (Mitt. Forsil. Vers. Aitst. Schicedens), 1911, No. S, pp. 7-9'/, figs. 

 35). — During the period 18SS to 1S93 a number of experimental areas were 

 established in the heath districts of Sweden to determine the best silvicultural 

 methods for these soils, a special study being made of the effect of burning 

 over the lands previous to reforestation. The results secured on these areas 

 ai"e here reported in detail. 



The species planted were pine, spruce, and birch. Regardless of soil and 

 cultural methods the pine alone has made good growth. Burning over the land 

 appears to increase the growth in some localities and to check it in others. 

 Generally speaking, deep soils with a medium amount of moisture show the 

 greatest improvement from burning over. Burning during dry periods is apt 

 to cause injurious ground fires. Burning off the vegetation from dry, sandy 

 soils, shallow soils, and wet soils is of doubtful value and may even prove 

 harmful. 



From 2 to .3 times as much seed was necessary to secure a stand on unburned 

 land as on bunufl land. 



A new sowing method in the mountains, Hauenstein (Forstiv. CentN., 

 n. ser., 3.', (1912), No. J,, pp. 207-217, figs. 3).— A hand seed drill for sowing 

 forest seed in rough mountainous lands is described and illustrated. 



The Spranz seed sower, Schinzinger (AUg. Forst u. Jagd Ztg., 88 (1912), 

 Apr., p. l.'iS, fig. 1). — A hand apparatus for broadcasting coniferous seeds is 

 illustrated and described. 



Progress report of forest administration in Baluchistan for 1910-11, 

 MuLRAJ and II. Dobbs (Rpt. Forest Admin. Baluchistan, WlO-11, pp. III+ 

 S.'i), — This is the customary report of the forest conservator relative to the 

 constitution, management, exploitation, and administration of the state forests 

 in Baluchistan, including a financial statement for the year 1910-11. The prin- 

 cipal data are appended in tabular form. The report is reviewed by the revenue 

 commissioner. 



DISEASES OF PLANTS. 



Bacteria in relation to plant diseases, II, E. F. Smith (Carnegie Inst. 

 Washington Piih. 27, vol. 2, 1911, pp. ^^III+368, pis. 20, figs. ^'/8).— This is in 

 continuation of the author's monograph on the diseases of plants due to 

 bacteria, the first volume of which has been noted elsewhere (E. S. R., 17, p. 

 263). In the first volume tlie general subject of bacteria and methods of work 

 was discussed, while in the second volume the history of the subject, general 

 considerations, and vascular diseases are treated. 



