Remarks.—An anomaly was observed at Zungomero. There appeared to be a double sea-breeze, the earlier set in between 9 and 10 a.m. every day. The second rose regularly at sunset, and at times there were gusts from the eastward at night. This phenomenon appears purely local, and caused by the cold winds of the Duthumi hills, which, when the sun disappears, find their way to the still heated head of the Khutu Valley.
Between Zungomero and the Mgeta Ford the sea-breeze is lost in the lower levels. After the Mgeta it sets in strong and regular. The rain also diminishes, though in winter tourbillons are common. When the E. wind blows cold it is a sign that rain is approaching, like the puffs preceding storms on the Zanzibar seas.
Rain in showers not common on the land above the ancient sea-beach; when on the shore there is more. This accounts for superior fertility.
Wind at Konduchi as on the coast generally. Calm morn till 9 or 10 a.m. Sea-breeze till sunset. Calm again till fetid land-breeze sets in at night, and endures until morn.
APPENDIX III.
Observations during a Voyage of Research on the East Coast of Africa, from Cape Guardafui south to the Island of Zanzibar, in the H. C.’s cruisers Ternate, (Captain T. Smee,) and Sylph schooner (Lieutenant Hardy). With short notes by Richard F. Burton.
January 2nd (1811), Wednesday. Sailed from Bombay in company with our consort, the Sylph schooner, Lieut. Hardy, having under convoy two merchant vessels bound to Mocha.
3rd, Thursday. Spoke Lieut. Hardy, who informed us his chronometer had unfortunately stopped: at noon the thermometer in the shade stood at 79°, lat. obsd. 18° 16′ N., long. 71° 36′ E., wind fresh from N.N.E. with fair weather.
4th, Friday. We had fine weather with a light northeasterly wind. Our thermometer, which had been fixed in the companion-hatch of the gun-room, was yesterday in the evening removed to a more exposed situation, to the Captain’s cabin on deck. At noon to-day observed it had fallen to 78°, being one degree lower than yesterday: lat. 17° 48′ N., long. 69° 47′ E.
5th, Saturday. During the preceding night a heavy dew had fallen, but the air to-day felt pleasantly dry and cool. Thermometer 77½°, lat. 17° 29′ N., long. 68° 46′ E.