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Tonight I obtained a good observation of Canopus, giving latitude 1 degree 38 minutes N. By Casella's thermometer I made the altitude of the Somerset at M'rooli 4,061 feet above the sea, showing a fall of 65 feet between this point and below the falls at Karuma in a distance of 37 miles of latitude.
The incident is beautifully introduced; and Casella's being made to select a production from the pen of the man who asks him to sing, very delicately implies a graceful cordiality in the musician's character.
By observations of Casella's thermometer I made the altitude of the river level at the island of Patooan 3,195 feet; thus from this point to the level of the Albert lake at Magungo there was a fall of 475 feet this difference being included between Patooan and the foot of Murchison Falls: the latter, being at the lowest estimate 120 feet, left 355 feet to be accounted for between Patooan and the top of the falls.
By astronomical observation I determined the latitude of Atada at Karuma Falls, 2 degrees 15 minutes; and by Casella's thermometer, the altitude of the river level above the sea 3,996 feet.
By Casella's thermometer, I determined the altitude of Shooa to be 3,877 feet 1,002 feet above the Asua river, and 89 feet lower than Farajoke. These observations of the thermometer agreed with the natural appearance of the country, the Asua river forming the main drain in a deep valley, into which innumerable rivulets convey the drainage from both north and south.
Another possible explanation of this curious and beautiful phenomenon will be given hereafter. The temperature was half a degree lower than when there were three of us in the cave two days before. I deposited one of Casella's registering thermometers, on wood, on a stone in that part of the floor which was free from ice, though there was ice all round it at some little distance.
We placed one of Casella's thermometers on a piece of wood on one of the wet stones, clear of the ice, and it soon fell to 34°. Probably the temperature had been somewhat raised by the continued presence of three human beings and two lighted candles in the small cavern; and, at any rate, the cold of two degrees above freezing was something very real on a hot summer's day, and told considerably upon my sisters, so that we were compelled to beat a retreat, not quite in time, for one of our party could not effect a thaw, even by stamping about violently in the full afternoon sun.
The thermometers were both Casella's, but that which registered 31° was the more lively of the two, the other being mercurial, with a much thicker stem: the difference in sensitiveness was so great, that when they were equally exposed to the sun in driving home, the one ran up to 93° before the other had reached 85°.
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