[12th October 1916] southerly wind grows feebler, then passes to a dead calm as human vitality declines. Streams of cooler air from the Northern mountains, first faint but quickly growing strong, come rushing down over the desert; the hot humid vapours are rolled back over the sea, and the “Shimāl” from the north, loaded with dust and sand, bending the palm-trees, curling the waters of the great rivers, sweeps away the moisture clouds, cools, dries, stimulates the air, and renews with life and vigour the devitalized bodies of men.
Sun-spots. In the month of June we observed a remarkable outburst of sunspots; of these one was very large, it must have been an enormous area of disturbance. Following the main spot over the face of the sun