644 EXPERIMENT STATION RECOED. 



chilgoza forests in Bnliu-liist;in, made extensive notes on the general t-baracter 

 of the chilKoza forests t)f Zliob and of the Takht-I-Sullnian. and advocates that 

 these forests be protected by the government. The forests are descril)ed and a 

 map given of them, with an account of the forest growth, and suggestions for 

 their l>etter management. 



Caoutchouc in Indo-China, C. and A. Spire (Lv Caoutchouc cu ludo-Vhiiic, 

 Paris: A. ChaUanel, 1905. p/). VIII+262, pis. 35, map i).— Part 1 of this work is 

 devoted to the botany of the caoutchouc-producing phmts of Indo-China ; part 2 

 to a study of the chemistry and industrial uses of the caoutchouc from different 

 sjiecies, and an account of methods of harvesting and of the conmiercial impor- 

 tance of the industry. The a|)pendix contains various tables showing the value 

 of different moneys, weights and measures, etc., with a bibliography of over a 

 hundred papers on the subject. 



Contribution to the chemistry of gutta-percha and caoutchouc, O. Mullek 

 {luauij. Diss., iiiir. Hern. 1!)()5, pp. 87. piis. 6). — This paper presents the results 

 of extensive investigations into the chemical nature of gutta-percha and caout- 

 chouc. 



DISEASES OF PLANTS. 



Plant diseases in Bulgaria, K. Malkoff (Ztschr. J'f1au.:e)ikraulc., 16 (1906), 

 ^o. Ji, pp. 212, 213). — An abstract of a report of the royal agricultural experi- 

 ment station at Sadovo, Bulgaria, the second part of which is taken up with 

 studies of the various plant diseases. 



Results are given, of experiments for the prevention of grain snmts, in 

 which the grain was treated with hot water, Bordeaux mixture, copper sulphate 

 solution, fornnildehyde, and dry air. The most efficient treatments were those 

 in which formaldehyde was used. 



In examining the susceptibility of the native varieties of wheat to smut 

 the author reports that the hard wheats {Triticum (luriini) were most attacked, 

 as much as S.*> per cent being smutted, while the soft wheats ranged from 20 

 to 44 per cent. It was also found that neither late nor early seeding had any 

 effect on the amount of smut present. 



In continuation of his investigations on the bacterial disease of sesame (E. S. 

 R., 17, p. 11(36), the author reports that 2 species of bacteria are present. 

 Soaking the seed in a 0.1 per cent solution of formaldehyde for 4 hours was 

 found to have an excellent effect in preventing this disease. 



Notes are given on the attack of chick-peas by Ascochijta pisi. which may be 

 controlled by spraying with a 1 per cent solution of Bordeaux mixture, and 

 on the leaf curl due to Exoascns ileforiiiaus, which may be prevented by spray- 

 ing witli a 3 per cent solution of Bordeaux mixture. A bacterial disease of 

 nuilberries and a new disease of plums, which is causing considerable injury, 

 are subjects for further investigation. 



Report of the section of plant protection of the Royal Servian agricul- 

 tural cheniical exiaeriment station at Belgrade, 1903 1905, X. Rano.ikwic 

 (Zt.^clir. Pflaiizenkraiik., 16 (1906), A'o. J,, pp. 207-212).— In 1002 there was 

 established in connection with the agricultural chemical experiment station 

 of the ministry of agriculture a section for plant protection, and the present 

 is the first report of the investigations carried on by this section. 



One of the principal subjects investigated has been the downy mildew of 

 grapes (Plasmopara viticola), for combating which experiments have shown 

 that spraying with Bordeaux mixture has jiroved efficient. Notes are given 

 on a nuuilicr of olber fungus diseases and insect enemies of economic plants. 



Agricultural botanical report for 1906, .1. Eriksson (K. Laudthr. Alcad. 

 Huiidl. och Tidskr.. >,5 (1906), Xo. 3-.'i, pp. 3.^7-^.98).— Descriptions of the fol- 



