1881.] Entomology. 571 
seeds are sown they are covered bya stratum of ground mixed 
with some vegetable mould, when the roller is slightly applied to 
it. Every five or six days the watering is to be renewed, in order 
to facilitate the germination. At the end of about thirty or forty 
days the young plants make their appearance, and as soon as they 
have gained strength enough they are transplanted at a distance 
of about six inches from each other, Three months after this 
operation they are transplanted again at a distance of from four- 
teen to twenty inches, according to their strength. Each trans- 
plantation requires, of course, a new watering, which, however, 
should only be moderately applied. The blossoming of the Pyre- 
thrum commences the second year, toward the end of May, and 
continues to the end of September.” Mr. Willemot also states 
that the plant is very little sensitive to cold, and needs no shelter, 
even during severe winters. 
The above-quoted directions have reference to the climate of 
France, and as the cultivation of the plant in many parts of North 
America is yet an experiment, a great deal of independent judg- 
ment must be used. The plants should be treated in the same man- 
ner as the ordinary Asters of the garden or other perennial Com- 
posite, 
cient. When about a month old, weed carefully. They should 
be transplanted to loamy soil during the rainy season of winter 
Or spring.” 
Our own experience with P. roseum as well as P. cineraria- 
Solium in Washington, D. C., has been so far quite satisfactory. 
ome that we planted Jast year in the fall came up quite well in 
the spring and will perhaps bloom the present year. The plants 
from sound seed which we planted this spring are also doing 
finely, and as the soil is a rather stiff clay and the rains have been 
many and heavy, we conclude that Mr. Willemot has overstated 
the delicacy of the plants. | 
In regard to manufacturing the powder, the flower heads 
Should be gathered during fine weather when they are about to 
