ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 733 



cause and the remedy. The other parts of the plant are also passed in 

 review. A large part of the work describes the mischief due to insects ; 

 the fungoid pests are less numerous, but they appear under their appro- 

 priate headings. A chapter at the beginning describes the usual 

 methods employed for the extirpation of the pests, and an account of 

 the apparatus used. 



Diseases of Cultivated Plants. — W. L. Lawrence* describes an 

 apple disease called Black-spot — a canker caused by the fungus Gloeo- 

 sporium malicorticis. Both the tree and the fruit are attacked, and 

 much injury is done. Preventive remedies are suggested. 



J. L. Sheldon f gives an account of the diseases of Melons and 

 Cucumbers during 1903-4:. Various fungi are signalled as the cause of 

 injury, but the most destructive disease was due to Golletotrichum 

 lagenarium, which caused anthracnose of the Water-melon. Many 

 culture experiments were made with the fungus. 



E. Mead Wilcox % gives an account of diseases of apple, cherry, peach, 

 pear, and plum, various kinds of canker, leaf-spots, rusts, scabs, etc., due 

 to fungi, with a discussion of the best fungicides to use. 



Karl Kornauth § publishes an account of animal and plant diseases 

 during 1004. He notes especially an attack of tomatoes by Septoria 

 Lycopersici, a great development of Erysiphe graminis on barley, and of 

 Puccinia glumarum on rye in Bohemia and Upper Austria. 



EL von Schrenk || chronicles the occurrence of Peronospora parasitica 

 on cauliflower in a greenhouse in Missouri. The case was of interest 

 from the isolated and sporadic appearance of the fungus. 



0. Clayton Smithy gives an account of plant diseases in Delaware. 

 These were chiefly leaf -spot diseases on species of Cucurbitacese (Cucum- 

 ber), Solanacese (egg-plant) and Leguminosse (beans, etc.). The spots 

 were due to various microfungi belonging to the Sphasropsideae and the 

 Pyrenomycetes. 



Perley Spaulding **describes a disease of Black Oaks due to Poly- 

 porus obtusatus. The fungus gains entrance through a wound and 

 extends through the heart-wood, changing the colour to yellow and then 

 almost to white. 



Studies in Myxobacteria.ft — E. Baur thinks that Zederbauer has 

 not seen any Myxobacteria ; the symbiotic forms he describes have 



* Washington Agric. Exp. Stat., Bull. lxvi.(1904) pp. 1-35 (12 pis., 67 figs.). See 

 also Bot. Centralbl., xcix. (1905) p. 277. 



t West Virginia Agric. Exp. Stat., Bull. xciv. (1904) pp. 120-42 (5 pis., 16 figs.). 

 See also tiot. Centralbl., xeix. (1905) p. 279. 



J Bull. Alabama Agric. Kxp. Stat., cxxxii. (1905) pp. 75-142. See also Bot. 

 Centralbl., xcix. (1905) p. 279. 



§ Zeitschr. Landw. Versuch. Oesterr., 1905, p. 236. See also Centralbl. Bakt., 

 xiv. (1905) pp. 653-4. 



|| Rep. Missouri Bot. Gard., xvi. (1905) pp. 121-4. See also Bot. Centralbl., xcix. 

 (1905. p. 320. 



\ Delaware College Agric. Exp. Stat., Bull. Ixx. pp 1-16 (2 pis., 6 figs.). See 

 also Bot. Centralbl., xcix. (1905) p. 310. 



** Rep. Missouri Bot. Gard., xvi. (1905) pp. 109-1 16 (7 pis.). See also Bot. Cen- 

 tralbl., xcix. (1905) p. 311. 



tt Archiv f. ProtUtenk., v. (1904) pp. 92-121 (1 pi. and 3 figs.). See also Bot. 

 Centralbl., xcix. (1905) pp. 221-2. 



