Jason Pratensis, in his book de morbis capitis, and chapter of Melancholy, hath these words out of Galen, [3143]"Let them come to me to know what meat and drink they shall use, and besides that, I will teach them what temper of ambient air they shall make choice of, what wind, what countries they shall choose, and what avoid.”  Out of which lines of his, thus much we may gather, that to this cure of melancholy, amongst other things, the rectification of air is necessarily required.  This is performed, either in reforming natural or artificial air.  Natural is that which is in our election to choose or avoid:  and ’tis either general, to countries, provinces; particular, to cities, towns, villages, or private houses.  What harm those extremities of heat or cold do in this malady, I have formerly shown:  the medium must needs be good, where the air is temperate, serene, quiet, free from bogs, fens, mists, all manner of putrefaction, contagious and filthy noisome smells.  The [3144]Egyptians by all geographers are commended to be hilares, a conceited and merry nation:  which I can ascribe to no other cause than the serenity of their air.  They that live in the Orcades are registered by [3145]Hector Boethius and [3146]Cardan, to be of fair complexion, long-lived, most healthful, free from all manner of infirmities of body and mind, by reason of a sharp purifying air, which comes from the sea.  The Boeotians in Greece were dull and heavy, crassi Boeoti, by reason of a foggy air in which they lived, [3147]_Boeotum in crasso jurares aere natum_, Attica most acute, pleasant, and refined.  The clime changes not so much customs, manners, wits (as Aristotle Polit. lib. 6. cap. 4. Vegetius, Plato, Bodine, method. hist. cap. 5. hath proved at large) as constitutions of their bodies, and temperature itself.  In all particular provinces we see it confirmed by experience, as the air is, so are the inhabitants, dull, heavy, witty, subtle, neat, cleanly, clownish, sick, and sound.  In [3148]Perigord in France the air is subtle, healthful, seldom any plague or contagious disease, but hilly and barren:  the men sound, nimble, and lusty; but in some parts of Guienne, full of moors and marshes, the people dull, heavy, and subject to many infirmities.  Who sees not a great difference between Surrey, Sussex, and Romney Marsh, the wolds in Lincolnshire and the fens.  He therefore that loves his health, if his ability will give him leave, must often shift places, and make choice of such as are wholesome, pleasant, and convenient:  there is nothing better than change of air in this malady, and generally for health to wander up and down, as those [3149]_Tartari Zamolhenses_, that live in hordes, and take opportunity of times, places, seasons.  The kings of Persia had their summer and winter houses; in winter at Sardis, in summer at Susa; now at Persepolis, then at Pasargada.  Cyrus lived seven cold months at Babylon, three at Susa, two at Ecbatana, saith [3150]Xenophon, and had