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upper regions, where the winds lay hold of it, scatter it, and reduce it to a vapor, whence it naturally enough comes to pass that the winds which blow from this quarter — the south and southwest — are of all winds the most rainy. And my own opinion is that the sun does not get rid of all the water which he draws year by year from the Nile, but retains some about him. When the winter begins to soften, the sun goes back again to his old place in the middle of the heaven, and proceeds to attract water equally from all coun- tries. Till then the other rivers run big, from the quantity of rain-water which they bring down from countries where so much moisture falls that all the land is cut into gullies ; but in summer, when the showers fail, and the sun attracts their water, they become low. The Nile, on the contrary, not deriving any of its bulk from rains, and being in winter sub- ject to the attraction of the sun, naturally runs at that season, unlike all other streams, with a less burthen of water than in the summer-time. For in summer it is exposed to attraction equally with all other rivers, but in winter it suffers alone. The sun, therefore, I re- gard as the sole cause of the phenomenon.

It is the sun also in my opinion which, by heating the space through which it passes, makes the air in Egypt so dry. There is thus perpetual summer in the upper parts of Libya. Were the position of the heavenly regions reversed, so that the place where now the north wind and the winter have their dwell- ing became the station of the south wind and of the noonday, while, on the other hand, the station of the south wind became that of the north, the consequence would be that the sun, driven from the mid-heaven by the winter and the northern gales, would betake