Another Remark (which to me is Demonstration) that Blights proceed from _Insects_, or their Eggs (being brought with the Easterly Winds) was the total Destruction of the _Turneps_, _Ann._ 1716, on the West Side of _London_; about _October_ we had dry Easterly Winds for a Week or ten Days, and several thousand Acres of _Turneps_, which were then well grown, turn'd Yellow and decay'd, unless in such Places only as were shelter'd by Hedges, Houses, or Trees, where they remain'd Green 'till the _Insects_, which came with the Wind, in about a Week's Time, destroy'd those also. Some Farmers imagin'd that the Birds which were there in great Flocks, had eaten the Leaves of their _Turneps_, and contriv'd all Means possible to destroy them, 'till I convinc'd them that the Birds were rather Friends than Enemies and came there to feed upon the _Caterpillars_, which were in such great Numbers, that each _Turnep-plant_ had not less than a Thousand upon it; and that _Insects_ frequently pass in Clouds and numberless Armies after this manner, is plain from several Instances, which have happen'd in my Time, and one of them (I think in _June, Ann._ 1717) passing over _London_ were suffocated (I suppose) with the Smoak of the Sea-Coal, and drop'd down in the Streets, insomuch that a square Court belonging to the _Royal Society_ was almost cover'd with them; these were of the _Fly Kind_, and fully perfected. It may be asked, perhaps, how these _Insects_ came to destroy the _Turneps_ only, and not touch the other Greens of the Fields, as _Cabbages_, _Carrots_, _Parsnips_, and the like? Every Herb has its peculiar _Insect_, like the Trees I have mention'd: Nay more than this, the _Insects_ which Nature hath design'd to prey upon the Flower of a Plant, will not eat the Leaves, or any other Part of the same Plant. The Leaves of Plants have their _Insects_ natural to them, the Bark and Wood likewise have their respective Devourers; and those several _Insects_ have other Kinds, which lay their Eggs, and feed upon them. I could yet give a much larger Account of Animals and Plants, how they have been particularly Infected, but I rather choose to refer my Reader to the Chapter at large, of _Blights_ and _Plagues_, in my _New Improvements of Planting and Gardening_, &c.