From M'rooli to the head of the Karuma Falls
the river is navigable; thus the observations of altitudes showing a
fall of one foot per mile must be extremely accurate.
The next observations to be compared are those from Karuma Falls
throughout the westerly course of the river to the Albert lake:--
River level below Karuma Falls . . . . . . . . 3,996 feet
Rionga's island 3,864--80 feet cliff . . . . . 3,784
= 212 fall. to the west.
River level at island of Patooan (Shooa Moru). 3,195
= 589 fall. from Rionga's island.
Level of Albert lake . . . . . . . . . . . . . 2,720
= 475 fall. from Patooan to lake.
From Karuma . . . . . . . . . . . . . . . . . 1,276 fall.
These observations were extremely satisfactory, and showed that the
thermometer (Casella's) behaved well at every boiling, as there was no
confusion of altitudes, but each observation corroborated the preceding.
The latitude of the island of Patooan by observation was 2 degrees 16':
we were thus due west of Magungo, and east of Karuma Falls.
CHAPTER XIII.
TREACHEROUS DESIGNS OF THE NATIVES.
We were prisoners on the island of Patooan, as we could not procure
porters at any price to remove our effects. We had lost all our riding
oxen within a few days; they had succumbed to the flies, and the only
animal alive was already half dead; this was the little bull that had
always carried the boy Saat.
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