And again, to shew how reasonably we may conjecture that 'tis _Insects_ which thus infect the Trees, let us only consider, that every _Insect_ has its proper _Plant_, or Tribe of _Plants_, which it naturally requires for its Nourishment, and will feed upon no other kind whatsoever: Therefore 'tis no wonder to see one particular sort of Tree blighted, when all others escape; as for Example, that Wind which brings or hatches the _Caterpillars_ upon the _Apple-Trees_, will not any way infect the _Pear_, _Plumb_, or _Cherry_ with _Blights_, because, were the Shoals of _Insects_ natural to the _Apple_, to light only upon those other Trees mentioned, they would then want their proper Matrix to hatch in; or if they were hatch'd already, they would Perish for want of their natural Food; so that 'tis morally impossible that all sorts of Trees should be blighted at the same time, unless the Eggs of every kind of _Insect_, natural to each Tree, could be brought at one time with the Wind, or that an Easterly Wind could contain in it at once, as many differing Periods of Cold or Heat, as would be requir'd to hatch and maintain each differing kind of those Creatures. The common People in the Country seem to be of my Opinion, that Blights are brought by the East Winds, which they are so well satisfied brings or hatches the _Caterpillar_, that to prevent the too great Progress of Blights, it is common for them when the East Winds blow, to provide large Heaps of Weeds, Chaff, and other combustible Matter on the Windside of their Orchards, and set them on Fire, that the Smoak may poison either the _Insects_ or their Eggs, as they are pass'd along. By this Contrivance I have often known large Orchards preserv'd, when the neighbouring Parts have suffer'd to the Loss of all their Fruit. And I have also seen these Fires made with good Success to destroy the _Caterpillars_, even after they were hatch'd, and had began to devour the Trees, by suffocating them, and forcing them to drop to the Ground, where they have been swept up in large Quantities, and kill'd. I have heard it affirm'd by a Gentleman of Reputation, that _Pepper-Dust_, being powder'd upon the _Blossoms_ of any Tree, will preserve them from Blights, which may be, because _Pepper_ is said to be present Death to every Creature but to Mankind. Now altho' this last Secret is too costly for common Use, yet it may be of Service in some particular Place for the Tryal of a new Tree, where a Taste of the Fruit is desired, and besides it helps to inform us, that Blights are occasion'd by Insects, or their Eggs, lodging upon a Plant, and that _Pepper Dust_ will not suffer them either to live, or to be hatch'd.