DISEASES OF PLANTS. 245 



306-310) ; The Adaptation of Different Raw Rubbers for Manufacturing Pur- 

 poses, by J. Jaques (pp. 311-317) ; The Technical Vse of Plantation Rubber 

 and the Conditions which, in the Production of Raw Rubber, are of Importance 

 for its Technical Application, with Special Reference to Kiclcxia (Funtumia) 

 and :Manihot Rubber, by F, Frank (pp. 317-326) ; The Extensibility of Vulcan- 

 ized Rubber, by C. Ch6neveau and F. Helm (pp. 327-335) ; The Oxidation of Sul- 

 phur by Nitric Acid, by li. E. Potts (pp. 336-343) ; Impact-Tensile Tests on 

 Rubber and a Comi)arison with Tensile and Hysteresis Tests, by C. Beadle and 

 II. P. Stevens (pp. 344-350) ; Mechanical Tests for Rubber, by K. Memmler 

 (pp. 351-373) ; The World's Trade in Raw Rubber, by E. Hecht (pp. 377-380) ; 

 and Factors Affecting the Valuation of Rubber Shares, by W. Tinnock (pp. 

 381-389). 



Method and tables for the determination of the volume and value accretion 

 in. standing trees, E. Andersson (Skogsvdrdsfor. Tidskr., 1912, Fackafd., No. 1, 

 pp. 20-32, figs. 3). — The derivation and use of tables for the determination of 

 volume and value accretion are here described. 



State afforestation in New Zealand, W. C. Kensington ( \eic Zeal. Off. Year- 

 hook, 1911, pp. 815-S2.'f). — The author calls attention to the need of afforesta- 

 tion in New Zealand and describes the work which the government has been 

 doing along this line in recent years. 



The Deliblat sand barrens in southern Hungary, E. von Ajtay {Osterr. 

 Vrtljschr. Forstxo., n. ser., 30 {1912), No. 1, pp. .>,3-66).—A historical and de- 

 scriptive account of afforestation and sand dune reclamation in the above 

 named region. 



A review of the results of the Saxony state forest administration for the 

 year 1910, Vogel {Tharand. Form. Jahrh., 63 (1912), Xo. 2, pp. lJ,3-ir,l).—A. 

 statistical and financial statement of the work and results of the forest admin- 

 istration for 1910. 



Annual report on the forest administration in Ajmer-Merwara for 

 1910—11, HuKAM Ch.\nd {Ann. Rpt. Forest Admin. Ajmer-Merwara, 1910-1 1, 

 pp. 30). — The annual report on the constitution and management of the state 

 forests of Ajmer-Mei"wara, including a financial statement for the year. Im- 

 portant data relative to areas, miscellaneous forest operations, expenditures, 

 revenues, etc., are appended in tabular form. 



Progress report of forest administration in the Punjab for the year 

 1910-11, C. P. Fisher (Rpt. Forest Admin. Punjab, 1910-11, pp. 3+20+LI).~ 

 A report similar to the above relative to the administration of state forests in 

 Punjab. 



Annual report of the forest administration for the year 1910—11 (Pflanzer, 

 8 (1912), Beiheft 1, pp. 42, pis. 6). — This comprises the annual report on the 

 constitution, management, and exi^loitation of the forests in the various dis- 

 tricts of German East Africa. The important data are appended in tabular 

 form. 



DISEASES OF PLANTS. 



Notes on new or little-kno-wn plant diseases in North America for 1910, 

 F. D. Heald (PhytopathoJogi/, 2 (1912), No. 1, pp. 5-22). — A critical review is 

 given of literature relating to various plant diseases reported in 1910. 



Two dangerous imported plant diseases, P. Spaulding and Ethel C. Field 

 (TJ. S. Dept. Agr., Farmers' Bid. 4S9, pp. 29, figs. 3). — Popular descriptions are 

 given of the white pine blister rust due to Peridermium strobi and the potato 

 black wart caused by CJirysophlyctis endobiotica. Both of these diseases have 

 been introduced from Europe, the first in the importation of young pine seed- 

 lings and the second by the importation of potatoes. Thus far the potato dis- 



