171 
ful treatments of powdery mildew witli potassium sulphide, £ oz. to a gal¬ 
lon of water. (D. G. F.) 
480. Jones, L. R. Black knot of plum and cherry. Fourth Ann. Rept. Vt. State Agric. 
Exper. Sta., Burlington, 1890, p. 141. Recommends cutting out and burning 
all knots as remedy; also advocates State legislation against disease. (D. 
G. F.) 
481. Jones, L. R. Potato blight and rot. Bull.Vermont State Ex. Sta., No. 24, Burling¬ 
ton, May, 1891, pp. 19-32,1 diagram. Records results of an experiment in the 
treatment of Pliytophthora infestans by use of Bordeaux mixture. Shows that 
a single application of the mixture, Aug. 18, after first appearance of the dis¬ 
ease, reduced the amount of rotten tubers tol5.3 per cent; two treatments, 
Aug. 18 and Sept. 16 reduced the amount to 9.7 per cent, as opposed to 53 per 
cent in the untreated portion of the field. Gives cost of the mixture and 
description for application. Records negative experiment of attempt to disin¬ 
fect tubers already affected. Concludes that tubers soaked in copper sulphate 
were more or less injured, as were also tubers soaked in warm water or in a 
moist oven, while plants from tubers heated to 106°-108° F. in dry oven for 6 
to 24 hours were on an average larger thau plants from untreated tubers. 
Gives data showing that the dry rot appears more commonly at stem than 
at seed end of tuber. (D. G. F.) (See also 4th Rept. Vt. Agric. Ex. Sta., 
Burlington, 1890, pp. 131-136.) 
482. Kellerman, W. A. Com smut. Bull. Kansas State Agric. Ex. Sta., Bot. Dept., 
No. 23, Manhattan, Aug., 1891, pp. 101-104. Gives results of hothouse and 
field experiment to determine the possibility of artificially infecting young corn 
plants with smut from sorghum ( Ustilago Beiliana ) and also with corn smut 
( Ustilago zea-mays), which proved entirely negative. Spraying experiments us¬ 
ing Bordeaux mixture, iron chloride, and potassium sulphide, did not prove ef¬ 
fective in the prevention of the smut. (D. G. F.) 
483. Kellerman, W. A. Second report on fungicides for stinking smut of wheat. Bull. 
Kansas State Coll. Agric. Ex. Sta., Bot. Dept., No. 21, Aug., 1891, pp. 47-72, pi. 
1. Records second series of experiments in prevention of the stinking smut 
by the use of fungicides in treatment of seed wheat. Calls attention 
to discrepancy between Jensen’s experiments and Kansas experiments, 
explaining it partially by discovery of inaccuray in thermometer used 
by the author, and thinks further the difference in estimation of smut 
may aid in the explanation. Discusses the extra increase in yield 
caused by the treatments and gives results from treatment of seed for 93 plats 
with 94 controls. Finds 18 of the treatments destroyed all the smut and 
gave a yield of grain greater than the average of the two adjacent untreated 
plats, 29 of the treatments decreased amount of smut to less than 1 per cent 
and gave yield larger than average of the two untreated plats, while 27 of the 
treatments injured the seed and 2 entirely killed it. Concludes with direc¬ 
tions for use of the Jensen liot-water method, which consists in immersing 
seed wheat in water at 131° F. for 15 minutes. (D. G. F.) 
484. Kellerman, W. A. Smut of oats in 1891. Bull. Kansas State Agric. Coll. Ex. Sta., 
Bot. Dept. No. 22, August, 1891, pp. 73-81. Estimates the amount of smut 
in vicinity of Manhattan, Kans., as varying from 3.2 to 7.92 per cent, in 
1891. Gives results of series of experiments to test efficacy of immersing 
seed in various strengths of solution of potassium sulphide for various 
periods of time as preventive of the smut. Also test of use of flowers of 
sulphur. Shows great efficacy of potassium sulphide, recommending for¬ 
mula of 1 pound sulphide in 20 gallons of water, seed to be immersed 24 
hours; or 2 pounds sulphide in 20 gallons water, seed to be immersed only 8 
to 12 hours. To determine more accurately the extra increase, i. e. the 
increase above that equal to the amount destroyed by the smut, five differ- 
