57 
276. Humphrey, J. E.—Continued. 
observes in a few cases small spore fruits which may be identical with Dr. 
Farlow’s pycnidia. 
277. -. The cucumber mildew [ Plasmopara Cubensis, (B. & C.)], (with plate). 
Ibid., pp. 210-212. With history of disease. Gives account of distribution and 
comparison with the only other known Peronospora upon Cucurbitacece in 
the United States, Plasmopara Australis, (Speg) Swing. Decides both species 
upon the wild star cucumber (Sicyos) and cultivated cucumber are Plasmoparae. 
278. -. The brown rot of stone fruits. (Monilia fructigena, Pers.) Ibid., pp. 213- 
216. Reports upon laboratory investigations with the fungus, showing that 
mummified specimens of plums are able to carry over winter the power of re¬ 
producing abundant conidia. From cultures in agar concludes Monilia fruc¬ 
tigena, Pers., as probably an autonomous fungus and likely to be readily erad¬ 
icated from orchards by clean culture. Recommends concerted action in 
removal of infected fruits. 
279. -. Potato scab. Ibid., pp. 216-220. Discusses work of other investigators 
upon the disease, expressing the opinion that the “deep” and “surface” 
scab are probably not specifically distinct. Thinks the invariable connec¬ 
tion of the scab with a parasitic fungus has not been proved. Finds the 
conditions which least favor the appearance of the disease afforded by light, 
open, thoroughly drained soil. 
280. -. Damping off (with figs.). Ibid., pp. 220-221. Identifies cause of disease 
with presence of Pythium de Baryanum, Hesse, and recommends prompt burn¬ 
ing of affected plants and removal of infested soil. 
281. -. The mildew of spinach [ Peronospora cffusa, (Grev.) Rabh.]. Ibid. Notes 
disastrous presence-of fungus in Massachusetts on an allied plant, Cheno- 
podium album. 
282. -. The grape-vine mildew [ Plasmopara viticola (B. & C.), Berl. & de Toni], 
Ibid., p. 222. Notes occurrence of the species upon Ampelopsis veitchii last 
October at Amherst, Mass. 
283. -. Potato rot [ Phytophtliora infestans, (Mont.) DBy.]. Ibid., p.223. Notes 
abundance in Massachusetts. 
284. -. The elder rust. ( JEcidium sambuci, Schw.). Ibid., p. 223. Notes de¬ 
structive abundance on cultivated varieties of Sambucus. 
285. -. The rust of blackberries and raspberries ( Cceoma nitens, Schw.). Describes 
the disease popularly. 
286. -. The hollyhock rust ( Puccinia malvacearum, Mout.). Ibid., pp. 224-225. 
Gives history of the spread of the disease introduced first from Chili. 
287. -. Disease of oats. Ibid., p. 225. Notes occurrence in Massachusetts of a 
disease of oats not caused by Uredinece, and connected more or less closely 
with bacteria. Refers to work of Division of Vegetable Pathology upon a 
similar disease (see This Journal, vol. vi, No. 2, p. 72). 
288. Kellerman, W. A. Note on the distribution and ravages of the hackberry branch 
knot (with plates). Twenty-third Ann. Meeting Kansas Academy of Science, 
Vol. xii, 1890 (1891), pp. 101-104. Gives counties of State from which the 
disease has been reported. Thinks it extends west to the limit of forest 
vegetation (see No. 62). 
289. -. Jensen’s recent experiments. The Industrialist, Manhattan, Kans., vol. 
xvi, No. 35, May 23, 1891 (2 columns). Quotes at length from a letter 
by J. L. Jensen, of Denmark, giving results of treatment in 1890 of seed 
wheat and oats for smut. Jensen finds the hot-water method and Kuhn’s 
method the only fully satisfactory ones. Quotes Jensen as concluding for 
four varieties treated that “there was gained by the hot-water method 1 per 
cent in replacing smutted heads with sound ones, but 8| per cent as an extra 
benefit; perhaps mainly due to the prevention of “invisible smut.” Notes 
