165 
with hot water, or the Mixture (No. 6) late in 
tlie evening-, when and where these animals will 
be secreted. 
Maggot. — The Larvee or Maggot, which 
feeds upon the roots of this plant, is very similar 
in shape to those produced by the Flesh-Fly, 
which so frequently chooses that its offspring 
should join with us in a leg of mutton, or any 
other joint composing a portion of our larder store ; 
but in point of size it is much inferior. It ap- 
pears that the parent deposits her eggs the fore 
end of May on the plant, near the surface of the 
ground, or some perhaps are deposited on the 
ground, which are influenced by the sun to 
send forth the Maggot. This, after feeding a 
short time, descends by degrees, and derives its 
support from the stem part of the roots, or that 
part which the main roots proceed from, where it 
feeds for a few weeks, forms a chrysalis of a cylin- 
drical shape, about an inch within the earth, in the 
vicinity of the plant, about the latter end of June, 
and produces the Fly in July, which so much 
resembles the House-Fly, (31%isca Domestica), 
that I conclude that it is precisely the same. It 
appears that there are two broods at least in one 
year, as we find the same species infesting the 
Onion and Turnip in the months of August and 
September, and producing the Fly in March, 
after lying in a chrysalis state all the winter. 
These, I suppose, are the progenitors of those on 
Cauliflowers at the above period, but they seldom 
