It is not against Experience, that Insects can live and encrease in Animal Bodies: How often do we find Men, Women and Children troubled with Worms? What Varieties of those Insects are often voided by them? And how should that be, if they were not either suck'd into the Stomach with the Breath, or taken into it with some unwholesome Food? For they cannot breed in such Bodies from nothing, without either their Eggs or themselves are brought thither by some Accident: For if they were the natural Produce of Animal Bodies, they would then be alike common to all, which we know they are not. I have been informed, that in the Year 1714, when this Mortality among the Cows was at its height, that towards the End of the Summer, some Farmers brought in fresh Cattel, and turning them into the same Fields, where many Cows had died before, they took the Infection and died likewise; but the following Spring those Fields were void of Infection, and the _Cows_ that were put into them did very well, but what were then put into the _Cow-Houses_, where the sick _Cows_ had been the Year before, were seiz'd with the Distemper, and died; which seems to inform us, that it was the Effect of _Insects_, which thro' the Warmth of those Stalls were preserv'd from the Severity of the Winter's Frost; but such as were left in the open Fields were destroy'd by the Cold. I have heard that a Woman about _Camberwell_ cured Six in Seven of her _Cows_, by giving them once a Week an Infusion of _Rhue_ and _Ale-wort_. But it may be ask'd, why these infectious Distempers, subject to Men, Cattle and Plants, are not universal? And why the Plague should not be as well in _India_, _China_, the South Parts of _Africa_ and _America_, as in these Parts of the World? (For I do not find it has ever been in those Places.) This Query gives me a farther Opportunity to suggest, that Insects are the Cause of it, and that they are brought with the Easterly Winds. In the first place, so far as I can learn, there is not naturally in _America_ any one Kind of Creature or Insect that is found in any other Part of the World, and the Plants likewise are all different from those of other Countries; as it is the same in _India_, _China_, &c. whose Products are quite different from what we find elsewhere. Supposing then that these pestiferous Insects are only the Produce of _Tartary_, let us consider to what Parts of the World they may be carry'd from thence with the Easterly Winds; and whether _India_, _China_, the South of _Africa_ and _America_, are not beyond their Reach, or can reasonably be affected by them. Whoever considers the Disposition of the Land and Water in the Globe, may thus account for the Passage of these Insects, with an Easterly Wind from _Tartary_, to all the Parts of _Europe_, _Asia-Minor_, _Palestine_, _Barbary_, and other South Coasts of the _Mediterranean Sea_, whither, 'tis highly probable, they may come, without meeting any thing in their Way to obstruct their Course.