Robert Alexander Stewart Macalister,
1911 Encyclopædia Britannica, Volume 7…
(1911)
“ The climate is good; in winter there is often hard frost and much snow, and even in summer, with a day temperature of 100° F., the nights are always cool. Fever, dysentery and ophthalmia, chiefly due to exposure to heavy dews and cold nights, are prevalent. Though still the market of the nomads, the surer and cheaper sea route has almost destroyed the transit trade to which it once owed its wealth, and has even diminished the importance of the annual pilgrim caravan to Mecca. ”
