Book 17
1.7
In addition to the wealth derived from merchandise landed at the harbours on each side, on the sea and on the lake, its fine air is worthy of remark: this results from the city being on two sides surrounded by water, and from the favourable effects of the rise of the Nile. For other cities, situated near lakes, have, during the heats of summer, a heavy and suffocating atmosphere, and lakes at their margins become swampy by the evaporation occasioned by the sun’s heat. When a large quantity of moisture is exhaled from swamps, a noxious vapour rises, and is the cause of pestilential disorders. But at Alexandreia, at the beginning of summer, the Nile, being full, fills the lake also, and leaves no marshy matter which is likely to occasion malignant exhalations. At the same period, the Etesian winds blow from the north, over a large expanse of sea, and the Alexandrines in consequence pass their summer very pleasantly.
