154 EXPEEIMENT STATION EECORD. 



has been followed witli good results iu seed beds and nurseries, but Its use in 

 the plantation is thought to be impracticable. 



The author comments on the absence of this fungus in American coffee rais- 

 ing countries, and attributes it to a number of factors, among them a lack of 

 suitable climatic conditions, natural enemies of Hemileia in America, and the 

 absence of suitable host species on which the alternate generations of the fungus 

 may develop. 



Injury to pines by smelter gases, K. Feist (Arch. Pharm., 2^9 {1911), 

 No. 1, pp. 7-9; abs. in CentU. BaU. [efc], 2. AM., S2 {1912), No. 6-12, p. SSI; 

 Bot. CentU., 116 {1911), No. 21, p. 55S). — This is an account of the author's 

 investigation of the changes produced in the foliage of pines injured by ex- 

 posure to gases evolved in the smelting of siderite. Comparative examination 

 of the needles of sick and of sound pines showed that the percentage of ash was 

 considerably increased in case of the former. There was also a notable increase 

 of sulphuric acid, which could come only from the air, while the alkalinity of 

 the ash itself was considerably lowered. 



New fungi on Japanese bamboos, J. Miyake and K. Haea {Bot. Mag. 

 [Tokyo], 2Jf {1910), No. 286, pp. SSl-S^l; o&s, in CentU. BaU. [etc.], 2. AM., 

 31 {1911), No. 11-15, pp. 321, S22).— The authors give the results of their 

 studies on a number of fungi of which the following appear to be new : 

 Lasiosphceria culmorum, Guignardia bambusce, MycosphcereUa iambusifolia, and 

 Phceospliwria hambusw. The article is mainly in the Japanese language. 



The importance of sanitation in the control of certain plant diseases, L. R. 

 Jones {Abs. in Phytopathology, 2 {1912), No. 1, p. ^6). — The author states that 

 while fungicidal sprays must continue to be the chief reliance in combating 

 many plant diseases, more attention should be given to the fundamental sani- 

 tary measures to secure the healthy development of the host plants. Recent 

 experiments in Wisconsin have shown this to be essentially true with certain 

 diseases of crops introduced into new regions for trucking and canning. These 

 Include the cabbage diseases, especially club root, blackleg, and yellows, some 

 pea diseases, the bacterial wilt of cucurbits, and crqwn gall of nursery plants. 



The covering power of the precipitation membranes of Bordeaux mixture, 

 B. F. Ltjtman {Phytopathology, 2 {1912), No. 1, pp. 32-1,1, figs. 6).— A study 

 on the physical proi>erties of the precipitate of Bordeaux mixture is reported, 

 in which an attempt was made to measure as nearly as possible the actual 

 area of the precipitation membrane produced by copper sulphate solution and 

 lime water, or milk of lime. Six formulas were used, including that known as 

 Pickering's Bordeaux mixture. 



About 100 cc. of the Bordeaux mixtures was made up, 1 cc. diluted with 

 from 200 to 400 cc. of water, and i cc. of this dilution placed on a cover glass 

 and allowed to diy, after which the membranes were examined microscopically, 

 drawn, and their relative area measured. It was found that increasing the 

 amount of copper sulphate and hme increases the area of precipitation film 

 produced. 



The amount of precipitation membrane, as shown by precipitation in hy- 

 drometer jars, was determined. The Pickering's Bordeaux showed an appar- 

 ently large amount of precipitate. This was only apparent, however, as shown 

 by the actual measurements which were given. 



In conclusion the author calls attention to the fact that bulk for bulk the 

 same quantity of Pickering's Bordeaux mixture does not have the same cover- 

 ing power as even the 2^ : 2A : 50 mixture. On the other hand, for the amount 

 of material used it produces the greatest amount of film area. 



