185 
for it appears, when the land is too loose, that the 
Carrot throws out a profusion of fibrous roots, to 
obtain a firm support, while, otherwise, we scarcely 
see any fibres, which renders the Carrot much 
finer. How to account for the Carrot being more 
free from this animal under the above treatment, 
I am at loss to know, except the grass land may not 
be resorted to by those insects, and a considerable 
time may elapse before progenitors emigrate to 
such parts. Onions also may repel the parent. 
Smith, in the Caledonian Horticultural 
Memoirs, says, that his practice is to sow his 
Carrots “always in one particular* spot of ground,” 
which he says, “ I have annually manured well 
with pigeon dung, laying almost as much of it, 
though of a hot nature, as if it had been rotten 
horse-duirg.” This, he observes, has never failed 
to produce an extraordinai7 crop, and he goes on 
to affirm, tliat “ a worm could not be found in my 
Carrots during the four years I have continued 
this practice 5 ” and remarks, that when he had 
used the horse-dung, “ they were so much can- 
kered that they were almost unfit for use.” Mr. 
Smith is led to think from his experiments “ that 
the pigeon-dung is a good preventive of the 
Worm in Carrots,” 
Henderson, as we find in the Caledo- 
nian Memoirs, has proved, by experience, that 
Carrots sown in March are liable to be destroyed 
by the above insect, while those sown the 1 st of 
May, keep (piite free, and observes, “ I am in-^ 
N 
