544 EXPERIMENT STATION RECORD. [Vol. 35 



Rubber (Trans. 3. Internat. Cong. Trop. Agr. 1914, vol. 1, pp. 59Jf-728, fig. 

 1). — This includes abstracts of the following papers on rubber, including reports 

 of discussions, at the Third International Congress of Tropical Agriculture. 

 London, July, 1914 : The Cultivation of Hevea brasiUensis in Uganda, by S. 

 Simpson (pp. 594, 595) ; Diseases of Hevea in Ceylon, by T. Fetch (pp. 596- 

 607) ; On Some Animal Pests of the Hevea Rubber Tree, by E. E. Green (pp. 

 608-636) ; Termes gestrrn as a Pest of the Para Rubber Tree, by H. C. Pratt 

 (pp. 637-640) ; The Principles of Hevea Tapping, as Determined by Experiment, 

 by T. Petch (pp. 641-651) ; The Preparation of Plantation Para Rubber, by 

 B. J. Eaton (pp. 6.52-678) ; Spottings in Plantation Rubber Due to Fungi, by 

 A. Sharpies (pp. 679-687) ; Ceara Rubber Cultivation and Manufacture in 

 Southern India, by R. D. Anstead (pp. 688-696) ; The Cultivation of Manihot 

 glaziovii in Uganda, by S. Simpson (pp. 697, 698) ; Increase in Yield from 

 Funtumia, elastica in Belgian Kongo by the Sparano Method, by A. Gisseleire 

 (pp. 699-701) ; The Methods of Tapping Cultivated Castilla Trees, and the Yield 

 of Rubber Therefrom, by P. Carmody (pp. 702, 703) ; The Methods of Tapping 

 Castilla Rubber Trees in Mexico, and the Yield of Rubber Which the Trees Fur- 

 nish, by A. Russan (pp. 704-712) ; Rubber Cultui-e in the German Colonies, by 

 F. Frank (pp. 713-719) ; Nece.ssity to the Rubber Industry of the Exact Labo- 

 ratory Determination of the Respective Values of Rubber, by Lamy-Torrilhon 

 (pp. 720-722) ; and Contribution to the Knowledge of the Mechanism of Coagu- 

 lation in Certain Rubber-Yielding Species, by F. Heini :;; i R. Marquis (pp. 

 723-728). 



A comparif on of the Brazilian and plantation methods of preparing Para 

 rubber, G. S. Whitby [Jour. Soc. Chem. Indus., 35 (1916), No. 9, pp. J,93-502).— 

 In this paper the author describes a comparative test of the methods of preparing 

 plantation rubber in the eastern Tropics and the wild rubber of Brazil. 



The rubber industry of the Amazon and how its supremacy can be main- 

 tained, J. F. WooDEOFFE and H. H. Smith (London: John Bale, Sons d Daniels- 

 son, Ltd., 1915, pp. XLVIII-\-435, pis. 42, figs. 4)- — This work comprises a study 

 of the rubber industry and the labor, social, and various economic conditions in 

 Brazil, with special reference to pointing out ways and means for the future 

 development and maintenance of the rubber industry in connection with the 

 general development and settlement of the Amazon region. 



DISEASES OF PLANTS. 



Plant pathology problems (Wisconsin Sta. Bui. 268 (1916), pp. 18-25, figs. 

 6). — Brief accounts are given of the various investigations in plant diseases that 

 are being carried on by the department of plant pathology. This work includes 

 a study of leaf roll and similar troubles of potato, seed disinfection for the 

 control of scab and Rhizoctonia, studies of nonparasitic diseases of potato such 

 as black heart, a study of alfalfa diseases, and the control of barley diseases, 

 cabbage yellows, and cucumber diseases. 



For the control of barley diseases, A. G. Johnson has investigated the effect 

 of planting at intervals of two weeks throughout the season with the result that 

 the early plantings in most cases developed more disease than the midsummer 

 plantings. Attempts were made to control the stripe and blotch of barley by 

 treating the seed with hot water, solutions of copper sulphate, copper sulphate 

 and salt, corrosive sublimate, and formalin, with the result that warm solutions 

 of foi'malin proved to be the most satisfactory treatment. Soaking seed for 

 three hours in a solution of 1 pint formalin to 30 gal. water at a temperature of 

 68° F. gave satisfactory control not only of tlie stripe disease but also of the 

 loose and covered smuts. 



