56 
266. Halsted, B. D. Mildew of sweet alyssum and radich. Ibid., vol. iv, No. 165, 
April 22, 1891, p. 189 (£ column). Notices preseuce of Peronospora parasitica 
on sweet alyssum spread from radishes in greenhouse. 
267. -. Decay spots upon leaves. Garden and Forest, vol. iv, No. 166, p. 201, April 
29, 1891. Remarks Botrytis vulgaris previously nourished on blossoms as 
cause of decayed patches upon many greenhouse plants. 
268. -. An abundant rust. Ibid., No. 171, vol. iv, June. 3, 1891, p. 262. Notices 
abundance of Cceoma nitetis, Schw. in 1891. 
269. —-. The forest in one of its relations to the orchard. Forest Leaves, Philadel¬ 
phia, March, 1891, vol. in, No. 5, pp. 68-70. Notes presence of black knot 
(Plowriglitia morbosa ) upon various wild species of Prunus and of Gymnospo- 
rangium upon wild Juniperus, recommending the destruction of wild species 
to protect the orchard trees. 
270. -. Destroy the black knot of plum and cherry trees (with figs.). An appeal. 
Bull., 78 Ag. Ex. Sta., New Brunswick, N. J., pp. 1-14. Describes disease 
popularly, with instruction of how it may be prevented and an appeal io? 
cooperation in its eradication. 
271. -. Smut fungi (with figs, from No. 53). Cultivator and Country Gentleman, 
Albany, N. Y., June 18, 1891, vol. lvi, No. 2003, p. 491 (2 columns). Gives 
popular account of different forms of wheat, oat, and corn smut, and con¬ 
clusions reached by Brefeld delivered in lecture before Agricultural Society 
of Berlin and translated in Journal of Mycology for 1890. Brings out the 
main conclusions of the author in a popular way. 
272. -. The black knot of plum and cherry trees (with figs.). American Agricultur¬ 
ist, vol. l, No. 5, May, 1891, p. 281. Gives popular description of disease 
with recommendation to cut out and destroy all infected portions. 
273. -. The soft rot of the sweet potato (with figs.). American Agriculturist, March 
1891, vol. l, No. 3, p. 146 (2 columns). Gives popular account of trouble caused 
by Ehizojms nigricans , Ehr., with recommendation for careful handling and 
digging to avoid spread of the fungus. Recommends storing in warm room 
until all “ sweating ” is over. 
274. -. The theory of fungicidal action. American Agriculturist, New York, June 
1891, vol. l, No. 6, p. 323 (1 column). Discusses philosophy of fungicides 
in popular language. Claims action to be twofold, first by killing fungous 
spores at forming, and second by killing them as they germinate upon the leaf. 
275. Humphrey, J. E. Notes on technique. II. Bot. Gaz. vol. xvi, No. 3, March 16, 
1891, pp. 71-73. Gives account of successful use of 1 per cent solution of 
osmic acid in killing zoospores preparatory to staining with alcoholic solu¬ 
tion of Hanstein’s rosanilin-violet. Finds cilia even in zoospores of Achyla 
polyandra readily stained by the method. 
276. -. The black knot of the plum [ Plowriglitia morbosa, (Schw.) Sacc.] (with 
plate). Eighth Ann. Rep. of Mass. State Ag. Ex. Station, Amherst, Mass., 
1890. Issued January 9, 1891. Gives report on laboratory investigations 
now in progress, with carefully prepared history of the disease. Reports the 
malady as strictly American and first described as of fungous origin by de 
Schweiuitz in 1831. Finds the disease distributed throughout the United 
States, but rare in Texas. From sowing of ascospores in agar the author 
has succeeded in bringing to maturity the true pycnidial form which had 
not previously been described. So far as the investigations have gone the 
author is able to connect positively only three forms, with the black knot 
the ascospores, the pycnidial form, differing from the pycnidial stage de¬ 
scribed by Dr. Farlow, and the summer or conidial stage. Decides the stylo- 
sporus form described by Farlow as not connected with Plowriglitia morbosa, 
and fails to find the presence of the spermogonial stage of this author, but 
