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New York AGRICULTURAL EXPERIMENT STATION. 151 
tance, all of these worked well. Two of them, however, viz., the 
first named and the No. 2 Lowell Improved, did not appear well 
adapted to create a fine and uniform spray. The difficulty 
appeared to arise from a mechanical defect in their manufacture, 
owing to which the stream when made very thin would not 
emerge from the whole circumference of the disk at once. The 
No. 1 did not show this difficulty and was capable of producing 
all gradations, from a very fine spray to a simple jet. 
It seems to me doubtful if any of the nozzles here mentioned 
is superior for use on high trees to the “Boss” nozzle, mentioned 
in a previous report.* 
AN EXPERIMENT With Homet-Grown PYRETHRUM. 
Seeds of Pyrethrum rosewm, the plant from which the so-called 
Persian or Dalmatian insect powder is manufactured, were a few 
years since quite extensively distributed by the Department of 
Agriculture for trial in various parts of our country. The reports 
ef the Department do not indicate that much attention was paid 
to them by the recipients. A package of seed from this source 
was received by this Station and planted in the spring of 1887. 
The plants did not bloom the first season and were counted as a 
failure. Contrary to expectations, however, they endured the 
winter without apparent harm, and early in the spring started a 
vigorous growth, which was soon followed by a profuse crop of 
blossoms. 
It has been stated + that this plant, when grown in America, 
has been found to possess little of the poisonous property that 
renders it valuable as an insecticide. In order totest the truth of 
this statement, a quantity of the unopened blossoms was gathered 
and dried ina shaded part of the office, after which they. were 
pulverized ina mortar. The strength of the powder as compared 
with samples of Buhach, an insecticide made from another species 
of Pyrethrum grown in California, was then tested by putting two 
erams of each ina large fruit jar, introducing live flies into the 
jars and noting the time required for the insects to become para- 
lyzed. In seven trials, the flies placed in the jar containing the 


*See Report New York Agricultural Experiment Station, 1885, page 219. 
+ Revue Horticole, 1888, page 148. 
