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four- winged Fly, of the Cynips genus. The 
parent, after making a puncture on the stem, just 
within the surface of the ground, deposits her eggs, 
which become inclosed in tlie healing wound, and 
after coming to animation, form a cell by feeding 
so as to afford little more than sufficient room to 
contain them. This is the cause of those tumours 
or knots so commonly seen on the stems. These 
knots ai'e increased in size as the inmate requires 
support, and advances in growth. 
For their Destruction. — Those excres- 
cences at the time of planting may be cut off, 
or forced off with the thumb-nail, sufficiently 
close to eradicate the Maggot. I do not remem- 
ber ever seeing’ the Cauliflower thus infested ; 
should it be the case, the same steps may be taken 
with safety and benefit to the plant. 
Caterpillars. — The Brassica tribe is often 
molested by various species of Caterpillars. The 
first which I shall briefly describe is about an 
inch and a quarter long. The whole is of a similar 
green to the leaf it feeds upon. Its whole body 
is clothed with fine hairs or down. The joints in 
the body are scarcely visible, in short, so shape- 
less is the whole insect when stretched out at full 
length, a position it generally assumes upon the 
surface of the leaf, that we could scarcely suppose 
it to be a living animal, and it might easily be over- 
looked, without close attention. In the middle of 
October these Caterpillars will mostly have retired 
