INDEED other hurtful Qualities of the _Air_ are more to be regarded than its Heat alone: for the _Plague_ is sometimes stopt, while the Heat of the Season increases, upon the Emendation of the _Air_ in other respects. At _Smyrna_ the _Plague_, which is yearly carried thither by Ships, constantly ceases about the 24th of _June_, by the dry and clear Weather they always have at that time: the unwholsome Damps being then dissipated that annoy the Country in the _Spring_. However, the Heat of the Air is of so much Consequence, that if any Ship brings it in the Winter Months of _November_, _December_, _January_, or _February_, it never spreads: but if later in the Year, as in _April_ or afterwards, it continues till the time before mentioned. BUT moreover, what was said before of some latent Disorders in the _Air_ having a share in spreading the _Plague_, will likewise have place in these Countries; as the last _Plague_ in the City of _London_ remarkably proves, the Seeds of which, upon its first Entrance, and while it was confined to a House or two, preserved themselves through a hard frosty _Winter_, and again put forth their malignant Quality as soon as the Warmth of the _Spring_ gave them force: but, at the latter end of the next Winter they were suppressed so as to appear no more, though in the Month of _December_ more than half the _Parishes_ of the City were infected. A _corrupted State_ of Air is, without doubt, necessary to give these contagious Atoms their full force; for otherwise it were not easy to conceive how the _Plague_, when once it had seized any Place, should ever cease but with the Destruction of all the Inhabitants: Which is readily accounted for by supposing an Emendation of the Qualities of the _Air_, and the restoring of it to a healthful State capable of dissipating and suppressing the Malignity.