187 
sown soon, I should suppose it would attain to a 
much greater size than when sown late, and 
therefore I need not add, afford a better oppor- 
tunity of escaping so great an injury. I am 
persuaded that young and old are alike liable to 
be attacked. The parent, as mentioned in the pre- 
ceding pages, deposits her eggs at different periods, 
and at such periods as when both the latter and 
former crop are growing. This induces me to 
conclude that it is en’oneous to suppose that those 
crops which are sown late will escape those depre- 
dators. 
Mac kray’s plan appears to be of some ser- 
vice, if the artichokes do not afford them proper 
food, and of course, those plots of ground will not be 
resorted to by the parent insects. But the ground 
required for artichokes is often of so small a 
compass, that it is more than iwobable that it will 
soon be discovered ; at least I should think, after 
one crop of Carrots, that it would be as bad 
bad as ever. I would just remark, that the rea- 
son the ground w'ill be clear of the insect is not 
that the insects perish because they cannot subsist 
on the artichokes, for when the plants are first 
planted out at the spring, it is about or before 
the time when the emago emerges from the pupa 
state ; therefore as she has her choice in placing 
her offspring, we may venture to say, that most 
generally nature has so ordered, that the instinct 
of the parent will lead her to establish her progeny 
W'here suitable food can be procured. 
N 2 
