Some of the first Breed I have known to spawn the same Season they were hatched; but so few in Quantity, and those so weakly, that the Winter killed them. I have also observed that in Rooms where constant Fires have been kept Night and Day, they have been so brisk and stout as to spawn in the Depth of Winter: but of all the Spawn I ever saw between _September_ and _March_, not one ever came to Life. This plainly evinces, that Natural Heat only produces Life in the Spawn, and that Artificial cannot. * * * * * Thus having shewn plainly the Number each Pair annually produce, I hope their great Increase is so sufficiently accounted for, that it need no more be wonder’d at. And having also shewn their seven Months Season of Breeding, if ’tis admitted, as I think ’tis plainly apparent, that in the other five Months, _viz._ from _September_ to _March_, when there is no such thing as Spawn but what is addle, and consequently cannot come to Maturity; it then naturally follows, that the Winter is the best Season for their total Destruction: which I shall make more fully appear presently, but must first refute two vulgar Errors. The first is, That many People imagine they are dead in Winter. This is a Notion so absurd, that it would hardly be worth mentioning, had I not by Experience found it had prevail’d with many People of Sense and Learning, as well as the Vulgar and Illiterate. The many Experiments by me shown at the Hospitals in the hardest Frosts last Winter, and in the Houses of the Nobility and Gentry, and to Sir HANS SLOANE the 30th of _December_ 1729, will, I hope, be deem’d a sufficient Refutation of that Error: For in the coldest Seasons the Application of my Liquor with a Feather only, made the Vermin bolt out of their Holes, and die before their faces. This they will do all the Year round in the coldest or hottest Weather. And I have seen, and do assert, they do bite in the cold as well as hot Seasons: but as our Blood is not so apt to inflame in Winter as in Summer, their Bites make but little Impression, and are consequently the less regarded. The second and most prevailing Error is, That Buggs bite some Persons, and not others: When in Reality they bite every Human Body that comes in their way; and this I will undertake plainly to demonstrate by Reason. It is generally observ’d and granted, that a Person under an ill Habit of Body, if he receives a small Cut or Wound, so slight as to be at first thought a Trifle, such Person’s Wound by reason of such ill Habit shall be attended with Inflammations and other dangerous Symptons, and be longer under Cure than Wounds, which when first receiv’d were larger, and consequently thought more dangerous. These Wounds shall be immediately healed on Persons in good Habit of Body, such good Habit preventing any Inflammations.