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posters to attract purchasers. Of course if kept in this man- 
ner, it loses all virtue as an insecticide. In Hurope, they keep 
the dried flower-heads until the powder is needed, when they 
are ground. It can also be utilized in the form of tea, a de- 
coction, an alcoholic extract, or a fume, and will be found very 
useful in certain cases. Pyrethrum is now produced in Cali- 
fornia on a large scale and is sold under the name of buhach. 
The great objection to this substance is its expense. It costs 
sixty cents a pound if bought of the Buhach Manufacturing Co., 
of Stockton, Cal., but as the powder is very light, a pound of 
it will cover a large number of plants. 
The use of lime and carbolic-powder is highly recommended 
by Prof. Riley. It should be sprinkled upon the plants early 
in the season, since it both kills the larvee and drives away the 
adults that come to deposit eggs. The method of preparation 
is as follows: twenty parts of superphosphate of lime are 
mixed with three parts of fresh air-slaked lime and one part of 
carbolic powder, which is made by thoroughly impregnating 
saw-dust with carbolic acid. It should be applied three or four 
times at intervals of three days. 
Kerosene-emulsion of extra strength and forcibly applied 
will also kill large numbers of caterpillars, but it is not as ef- 
fective as could be desired. 
But al! these applications of poison will remain theroretical 
if cabbages bring no better prices than in 1895, for the appli- 
cation under such conditions would cost more for time, labor 
and material than the crop could be sold for. All remedies 
must be applied, no matter what they are, throughout the in- 
fested region, otherwise a few negligent farmers can breed 
enough cabbage butterflies to infest the whole neighborhood. 
Enemies.—Both of our species of cabbage butterflies have a 
large number of enemies. Besides the animals and birds al- 
ready mentioned, there are a large number of cannibal insects 
that reduce their numbers, and besides these there are a large 
number of true parasites that infest their larve and pupe. 
The caterpillars of both kinds of cabbage worms are frequently 
destroyed by a small, black, four-winged parasite, the Apan- 
teles glomeratus Linn. The maggots of this parasite, after 
living in the interior of the host, eat through the skin, and spin 
about themselves a yellow silken cocoon, about an eighth of an 
