EXPERIMENTS IN THE GROWTH OF PYRETHRUM. 95 
for the reasons first given I do not hesitate to say that there can be no 
danger in sending them even there, and as it seems that there is no 
law to warrant their detention they may certainly be forwarded without 
fear of injury. 
Respectfully, 
C..V.. RILEY, 
Entomologist. 
Hon. GEO. B. LORING, 
Commissioner of Agriculture. 
FURTHER REPORTS ON THE GROWTH OF PYRETHRUM. 
CALIFORNIA. San Bernardino, August 12, 1883.—JAMES 8S. BRooks, 
I have a few plants of pyrethrum now in flower, raised from seed that 
I sent East for last year, but as I do not know how to prepare the pow- 
der for the purpose of destroying insects I shall let the seed ripen and 
plant again next season, hoping that I will succeed better, as but very 
few plants came up. 
CANADA. Dundas, Ont., June 22, 1882.—JoHN A. FISHER. 
I have much pleasure in inclosing you three flowers raised by me 
from the pyrethrum seed which you so kindly sent me a little over a 
year ago. The plants that I have are in a perfect mass of bloom. 
CANADA. Riverside, Toronto, September 9, 1883.—ALFRED H. Moore. 
A plant of the 1881 seedlings of pyrethrum rose bloomed last May 
(1883) so gloriously as to elicit a notice in the Hvening Telegram of this 
city. Had in bloom, nearly at same time, twenty-seven heads, but no 
fecundated fruit. Are the flowers all entomophilous, and so abortive? 
ILLINOIS. Champaign, July 12, 1882.—S. A. FORBEs. 
Concerning the pyrethrum seed sent me, I believe that I have not re- 
ported that I succeeded in raising a few plants last year, although most 
failed because of the severe drought. Those that grew survived the 
winter, blossomed this summer, and matured their seed about three 
weeks ago. This was Pyrethrum roseum. The seed of both species has 
come up sparingly this spring, injured this time by the extremely wet 
weather. 
Iowa. Garrison, June 10, 1882.—JAMES H. DICKSON. 
I received a package of pyrethrum seed (insect-powder plant) in the 
spring of 1881 from Professor Riley, and sowed seed in a shallow box 
and placed it in a hot-bed. The seed nearly all grew, and were trans- 
planted to the garden the latter part of April. They grew fast and had 
«a few biooms the latter part of September, but not enough to pay for 
the gathering. before hard-freezing weather set in I gave the bed a 
