DISEASES OF PLANTS. 347 



gypsuui or sulphate of limo. Tho addition of the sulphate of lime is said 

 to favor the transformation of tlio copper hydrate, nialves tlio solutions more 

 adherent, and favors tlie better distrilnition (if the snlpluu-. 



The pathological respiration of grape leaves attacked by downy mildew, 

 L. I'AVAKi.NO (.1/// 1st. liol. liiir. J'liriu. 2. scr., 11 {WOii), p. hi; iihs. in Hot. 

 Cent hi., 102 (IVOG), Ao. 2S, pp. 38, ;J.';).— The efCeet of Peronospora on the 

 respiration of grape leaves was studied and found to exert a marked influence 

 on the normal respiration, as well as the intramolecular respiration of the 

 leaves. The normal respiration is greatly accelerated by the downy mildew 

 and the intramolecular respiration is much more active in diseased leaves. 



Ou Investigating the presence of ferments in both diseased and normal 

 leaves, the author found that the diseased leaves contained much greater 

 quantities of oxidase than normal and that the same is true for injured leaves 

 or nonparasitic diseases. These oxidases he does not believe ar(> directly pro- 

 duced by the parasites, but are the result of a reaction of the protoplasm of the 

 plant when i-ontiguous to the parasite or to some poisonous substances ex- 

 creted by the parasites. He believes that the oxidizing ferments which are 

 found in various organs of the grape attacked by Peronospora are a cause of 

 the disease of wine known as '" cnsse." 



The gooseberry mildew in Europe, its spread and prevention, J. Eriksson 

 (Ztschr. I'flanzcnkrank., 16 (1906), No. 2, pp. 83-90, pis. 2, map i).— An ac- 

 count is given of the occurrence and distribution of the gooseberry mildew 

 (Sphocrotheca mors-uvw) in which the author mentions its appearance in dif- 

 ferent countries and indicates later stations of its occurrence. The life history 

 of the fungus is described and brief suggestions given for its control, A brief 

 bibliography is appended. 



Notes on Gloeosporium ribis, II. Klebahn (Ztschr. Pflanzenlcran'k., 16 

 (1906), A'o. 2, pp. 65-83, pis. 2). — In his studies on some of the imperfect 

 fungi, the author has carried on experiments with Glccosporium ribis, and from 

 his investigations he is led to recognize its ascospore stage. This stage he 

 describes as I'seudopcziza ribis n. sp., and inoculation experiments have shown 

 that this fungus and the conidial form are related. 



Studies on Gloeosporium, P. Viala and P. Pacottet (Ann. Inst. Nat. Agron., 

 2. ser., 3 (1906), Xo. 1. pp. 31-83, figs. //.3). — Studies are reported on Gloeo- 

 sporium ncrviscquum, the cause of the sycamore anthracnose, in which the 

 yeast-like and cyst reproductive bodies are described. 



Notes are also given on some similar bodies observed in Ascochgta pisi. A 

 description is included of the cultural changes and methods employed in the 

 investigations. 



Notes on leaf blight of sycamore, J. Beauverie (Compt. Rend. Acad. Sci. 

 [Pari.s], 11,2 (1906), No. 26, pp. 1551-1554) .—A description is given of the leaf 

 blight of the sycamore due to Glomsporium nervisequiim or Gnomonia veneta, 

 particular attention being called to its occurrence in nurseries. In some parts 

 of France this fungus has been exceedingly destructive, especially on young seed- 

 lings, and preventive treatments are suggested. 



Cortinarius as a mycorrhiza-producing fungus, C. II. Kauffman (Dot. 

 Gaz., .'i2 (1906). No. 3, pp. 208-21 'i. fig. 1). — According to the author, while con- 

 sideraiile attention has been paid endotrophic mycorrliiza, th(; fungi which cause 

 ectotrophic mycorrliiza have not been investigated except in a very few cases. 

 Some investigation is needed to determine the fungi causing mycorrhiza in 

 order to determine some of the problems which have to do with its physiological 

 action. 



The author had observed that specimens of Cortinarius were constantly found 



