1 So then spring is the most salubrious, next after it comes winter; summer is rather more dangerous than salubrious, autumn is by far the most dangerous. But as regards weather the best is that which is settled, whether cold or hot, the worst that which is the most changeable, and that is why autumn brings down the greatest number. For generally about midday there is heat, but at night and in the early morning, cold, as also in the evening. Thus the body, relaxed by the preceding summer, and now by the midday heat, is caught by the sudden cold. But while this chiefly occurs at this season, so whenever the like happens harm is done.
In settled weather fine days are the most salubrious, rainy better than foggy or cloudy days; and in winter the best days are those in which there is an entire absence of wind, in summer those in which westerly winds blow. As for the other winds, the northerly are more salubrious than those from the sunrising or south; nevertheless, these vary somewhat according to the character of the district. For almost everywhere wind when coming from inland is salubrious, and injurious when from the sea. And not only is health more assured in settled weather, but pre-existing diseases also, if there have been any, are milder and more quickly terminated. But the worst weather for the sick man is that which has