DISEASES OF PLANTS. 359 



growth of thi.s swelling, there arise in infected cells a number of multi- 

 nucleated amceba which at first do not coalesce into a plasmodium. 

 The formation of the plasmode is preceded by characteristic changes 

 in the structure of the amceba? and their nuclei and takes place onl}'^ 

 after the complete exhaustion of the nutrient cell. During the vege- 

 tative period of its development the parasite does not kill the nutrient 

 cell but simply causes hypertrophy. 



Investigations of plant diseases, A. D. Selby (OJiio >^ta. Bui. Ill, p}>. 93-142, 

 fifjti. 12). — Thi.s ])ulletin is a summary of the work carried on at the Ohio Station in 

 the control of the fungus diseases of jilants and was prepared as a part of the col- 

 lective exliihit of the American experiment stations at the Paris P^xposition in 1900. 



Fungus foes of vegetable fruits, B. D. Hal.sted {Pennsylvnnia Dept. Agr. Bvl. .59, 

 pp. 39,fi(iii. 20; Rpt. 18.99, pp. 573-605, figs. 20). — A somewhat popular bulletin treat- 

 ing of the more common vegetable fruits, in which their diseases are briefly described 

 and suggestions given for their prevention. 



Plant diseases investigated at the botanical laboratory of the Institute 

 Agricole during 1899, E. March.\l {BuL Agr. [Brusseh'], 16 (1900), No. 1, 

 pp. 9-21). 



Smut of cereals, PL Thomas {Bid. Rojf. Soc. Agr. IJ Ed Belg., 1899, pp. 157, 1.58). 



A review of the stinking smut of wheat in Belgium in 1898, G. Staes 

 {Tijrhrhr. I'ldntenzirJdi'u, 5 (1899), Ao.s. 5-6, pp. 170-176). 



Smut diseases of plants, H. Vanderyst (Extr. Bui. Agr. \_Briim'ls'\, 15 {1899), 

 pp. 40). 



Wheat smut, A. ISouroue {Jour. Soc. Agr. Brahant-Hamcmt, 1899, pp. 272, 273). 



The smuts of Bermuda grass and their distribution, P. Magnus (ie.s ustilaginees 

 du Cynodon ducti/lon et leiir distribution geographique. Lons-le-Saulnier: Declume, 1899, 

 pp. 8) . 



A bacterial disease of beans, G. Delacroix {Monit. Hort. Belg., 1900, pp. 26, 27). 



A spot of tobacco leaves, A. Splendore {G-iorn. II Tobacco, 1899, No. 34; abs. 

 in Centbl. Baht. v.. Par., 2. AbL, 6 {1900), No. 11, p. 579).— The spots are said to be 

 dry, olive-brown, and irregular and contain the mj^celium of a fungus. Leaves 

 placed in a moist chamber developed an Alternaria indistinguishable from A. tenuis 

 and a Macrosporium. Whether the fungi were the cause of the spots was not deter- 

 mined. In Java a similar disease is common and is most abundant during rainy 

 seasons. 



Influence of seed parasites on the grow^th of sugar beets, J. Stoklasa {Hucr. 

 edge, 28 {1899), jjp. 105-108). 



A bacterial rot of onions, F. C. Stewart {Proc. Soc. Prom. Agr. Sci. 1899, pp. 

 43-46, pis. 2). — The su])stance of this paper has been already noted (E. S. R., 12, 

 p. 56). 



Ergot from wild rice, E. H. Dexnistox {Pharni. Per., 18 {1900), No. 3, pp. 118, 

 119). 



Two new diseases of Phlox, J. Ritzema-Bos {Tijdschr. Plantenzichteii, 5 {1899), 

 No. 2, pp. 27-32). — Descril)es attacks of Tylencluis devastatri.i:, Septoria pidogis, and 

 Leptosjyhieria phlogis. 



A new parasite on leaves of Vinca major, F. Cavaea and P. A. Saccardo 

 {Nuoro (rior. Bot. It(d., v. ser., 6 {1899), pp. 7; abs. in Bot. Centbl., 82 {1900), No. 5, 

 pp. 141, 142). — On leaves of Vinca attacked by Puccinia berkeleyi the authors report 

 finding a new Tu})erculina, to whicH the name T. sbrozzii is given. 



A dangerous parasite of fruit trees, J. Ritzema-Bos ( Tijdschr. Plantenzielien, 

 5 {1899), No. 5-6, pp. 168, 169). — TK^^cx'ihea Agaricus s(piarrosus. 



Peach leaf curl and its prevention, G. Staes {Tijdschr. PlantenzieUen, 5 {1899), 

 8873— No. 4 5 



