Arinos from the right side; but I was puzzled whether this was
not a mere arm of the Arinos. In the quick survey I was making, and with
the many things which occupied my mind at every moment, the river being
moreover so wide, it was impossible, single-handed, to survey everything
carefully on every side. Therefore this may have been a mere arm of the
Arinos which I mistook for a tributary. It was not possible for me to
deviate from my course every moment to go and ascertain problematic
details, but it will be quite easy for subsequent travellers to clear up
this point now that attention has been drawn to it.

An island, 1,000 m. long--Olivia Island--was found at the point where the
main arm of the river flowed in a direction of 345 deg. b.m., and where to
the north-west, north, and north-east, three hill ranges were before
us--one 300 ft. high, extending from south-west to north-east on the left
side of the river; another thickly wooded hill from west to east, also
300 ft. high; and yet another one, the highest of all, behind it from
S.S.W. to N.N.E., on the right bank. The river was 350 m. wide, and its
water almost stagnant.

Another barrier of rock held up the stream. We came to an island 800 m.
long, 300 m. wide--Sabrina Island--on the left side of the stream, which
showed a beautiful spit of white sand at its southern end.

I halted on the bank where the island began in order to take observations
for latitude and longitude, and as the day was a very clear one I took
forty-eight consecutive sights of the sun with the sextant. Lat. 10 deg.
35'.1 S.; long. 58 deg. 12' W. While I was busy observing the sun I thought I
heard curious noises in the forest just behind me. The dogs all of a
sudden jumped up, barking furiously, and I heard the sounds of what
seemed an escaping person dashing away through the thick growth near the
stream. My men were greatly excited, saying it was an Indian who had come
quite close to me, and was about to shoot an arrow while I was busy with
my sextant and chronometers. All through lunch they sat with their loaded
rifles next to them, in case we might be attacked.

The river now flowed in a straight line for 5,000 m. in a north-westerly
direction. Half-way along was a large triangular island--Pandora Island;
then farther on the left another island, 2,000 m. long--Sibyl Island.

The river was of extraordinary beauty in that region. The tall range of
hills to the north-west of us showed beau