direct contrary Way.

And Plants are no less subject to be destroy'd by Insects, than Men and
Quadrupedes, is I have explain'd in the Chapter of Blights, in my _New
Improvements of Planting and Gardening_.

_Plants_ of all degrees are subject to Blights, which are so variously
communicated to them, that sometimes a whole Tree will perish by that
Distemper; now and then a few Leaves, or Blossoms only, and perhaps a
Branch or two, will be shrivel'd, or scorch'd by it, and the rest remain
green and flourishing. I have yet never observ'd this Disease to happen
among Plants, but upon the blowing of sharp and clear _Easterly_ Winds,
which are most frequent in _England_ about _March_; but sometimes happen
in other Months. It is very observable, that the _Caterpillars_ generally
attend these Winds, chiefly infecting some one sort of Tree more than
another, and even then not every where upon the kind of Tree they attack,
but some particular Branches only; from which Observations I think we may
draw the following Inferences, either that the Eggs of those Insects are
brought to us by the _Easterly_ Winds, or that the Temperature of the Air,
when the _Easterly_ Winds blow, is necessary to hatch those Creatures,
supposing their Eggs were already laid upon those infected Parts of the
Trees the preceding Year.

The Blights which are attended with large _Worms_ or _Caterpillars_, seem
to be rather hatch'd with the _East_ Wind, than that the Eggs of those
Creatures are brought along with it; but those Blights which produce only
those small Insects which occasion the curling of the Leaves of Trees, may
proceed from Swarms of them, either hatch'd or in the Egg, which are
brought with the Wind.

Some perhaps may object, that the _East_ Wind is too cold to hatch these
Creatures; how comes it then that we find them hatch'd when those Winds
reign? Or is it reasonable to conjecture that the same degree of Heat is
necessary to enliven an Insect as is required to hatch the Egg of a
Pullet? The Insects of _Norway_, _Iceland_, and such like cold Climes,
must certainly have less Heat to produce them, than Creatures of the same
Race must necessarily have in those Climates which lye nearer to the Sun.
Every Creature, without doubt, requires a different Period of Heat or Cold
to enliven it, and put it in Motion, which is prov'd by so many known
Instances, that I conceive there is no room for any dispute upon that
score.

But there may yet be ano