But if those things be in daily use, and exposed to the open Element, they never breed any Vermin: So that the Generation of those things are generally caused by Accidents; not but that there is Matter in the Radixes of such things for the Generation of such Vermin. 3. From the pernicious Smells and putrified Vapours that do proceed from old Beds, are generated the Vermin called Bugs, (of which, neither the Ancients, nor the Modern Writers of this Age, have taken any notice) according to the Degrees of Uncleanness, Nature of the Excrements, and the Closeness of the Places where Beds stand: for some Peoples Excrements are not so unclean as others: Also in all close Places, especially in Cities and Great Towns, the Spirits and thin Vapours of the Air are suffocated, which makes the same Air Sulphurous and Humid, whence does proceed Putrifaction. Therefore it is not to be thought a General Rule, _That all old Beds should breed Bugs_, as some (who are ignorant of the Operations of Nature) will be apt to say, _If one Bed do breed them, why not all?_ No, it is according to the nature of the Uncleanness, and other Accidents that do happen: For where (as is said before) the thin pure Air, with the refreshing Influences of the Sun and Elements, have their free egress and regress, all such Matter is destroyed whence such Vermin is produced. The Original of these Creatures called Bugs is from Putrifaction, occasioned by stinking Scents and Vapours which do proceed from the Bodies and Nature of Men and Women, and the mixing or incorporating of these Vapours with moist and sulphurous Airs: For where there is no Heat nor Humidity, there can begin no Putrifaction. Therefore all that have attributed the Generation of this Vermin to Wood, as Bedsteads, and the like, are grosly mistaken in the Productions of Nature; for there is no Matter in Wood that can generate such a Vermin, it being productive only or chiefly of two Creatures in _England_, _viz._ of Wood-Lice, and a small Worm. These Wood-Lice are never generated but in Places where the Sun and Air have not their free Influences, so that there is store of Humidity contracted; and when the Sun comes to such Degrees of the Zodiack, this Creature is generated, which is of as different a Nature from Bugs, as sweet Wood is from a stinking Bed. Also Wood does breed a certain small Worm, but never till the Salts Nature and Power is decayed through length of time; then the Air enters it, which does presently cause it to contract a humid Quality, from whence proceeds Putrifaction, whereof, when the Sun is powerful, this Worm is bred. But so long as Wood continues sound, and is kept dry, the Air having its free Influences on it, I affirm, That no sort of Wood ever breeds any kind of Vermin.