A climate resembling that of the Deshtistan prevailed along the entire southern coast of the Empire, from the mouth of the Tigris to that of the Indus. It was exchanged in the lower valleys of the great streams for a damp close heat, intolerably stifling and oppressive. The upper valleys of these streams and the plains into which they expanded were at once less hot and less moist, but were subject to violent storms, owing to the near vicinity of the mountains. In the mountains themselves, in Armenia and Zagros, and again in the Elburz, the climate was of a more rigorous character--intensely cold in winter, but pleasant in the summer time. [PLATE XXVII., Fig. 3.] Asia Minor enjoyed generally a warmer climate than the high mountain regions; and its western and southern coasts, being fanned by fresh breezes from the sea, or from the hills of the interior, and cooled during the whole of the summer by frequent showers, were especially charming. In Syria and Egypt the heats of summer were somewhat trying, more especially in the Ghor or depressed Jordan valley, and in the parts of Egypt adjoining on Ethiopia; but the winters were mild, and the springs and autumns delightful. The rarity of rain in Egypt was remarkable, and drew the attention of foreigners, who recorded, in somewhat exaggerated terms, the curious meteorological phenomenon. In the Cyrenaica there was a delicious summer climate--an entire absence of rain, with cool breezes from the sea, cloudy skies, and heavy dews at night, these last supplying the moisture which through the whole of summer covered the ground with the freshest and loveliest verdure. The autumn and winter rains were, however, violent; and terrific storms were at that time of no unusual occurrence. The natives regarded it as a blessing, that over this part of Africa the sky was “pierced,” and allowed moisture to fall from the great reservoir of “waters above the firmament;” but the blessing must have seemed one of questionable value at the time of the November monsoon, when the country is deluged with rain for several weeks in succession.
On the opposite side of the Empire, towards the north and the north-east, in Azerbijan, on the Iranian plateau, in the Afghan plains, in the high flat region east of the Bolor, and again in the low plain about the Aral lake and the Caspian, a severe climate prevailed during the winter, while the summer combined intense heat during the day with extraordinary cold--the result of radiation--at night. Still more bitter weather was experienced in the mountain regions of these parts--in the Bolor, the Thian Chan, the Himalaya, and the Paropamisus or Hindu Kush--where the winters lasted more than half the year, deep snow covering the ground almost the whole of the time, and locomotion being rendered almost impossible; while the summers were only moderately hot. On the other hand, there was in this quarter, at the very extreme east of the Empire, one of the most sultry and disagreeable of all climates--namely, that of the Indus valley, which is either intolerably hot and dry, with fierce tornadoes of dust that are unspeakably oppressive, or close and moist, swept by heavy storms, which, while they somewhat lower the temperature, increase the unhealthiness of the region. The worst portion of the valley is its southern extremity, where the climate is only tolerable during three months of the year. From March to November the heat is excessive; dust-storms prevail; there are dangerous dews at night; and with the inundation, which commences in April, a sickly time sets in, which causes all the wealthier classes to withdraw from the country till the stagnant water, which the swell always leaves behind it, has dried up.