built a stone wall to the height of several feet on the landward
side of it, as I guessed that the natives posted near to me would prove
wild in their shooting.

These labours occupied the rest of that day, and at night we retired to
higher ground to sleep. Before dawn on the following morning we returned
and took up our stations, some on one side of the channel and some on
the other which we had to reach in a canoe brought for the purpose by
the river natives.

Then, before the sun rose, Captain Robertson fired a huge pile of dried
reeds and bushes, which was to give the signal to the river natives
far away to begin their beat. This done, we sat down and waited, after
making sure that every gun had plenty of ammunition ready.

As the dawn broke, by climbing a tree near my _schanze_ or shelter, I
saw a good many miles away to the south a wide circle of little fires,
and guessed that the natives were beginning to burn the dry reeds of the
swamp. Presently these fires drew together into a thin wall of flame.
Then I knew that it was time to return to the _schanze_ and prepare. It
was full daylight, however, before anything happened.

Watching the still channel of water, I saw ripples on it and bubbles
of air rising. Suddenly there appeared the head of a great
bull-hippopotamus which, having caught sight of our rag barricade,
either above or below water, had risen to the surface to see what it
might be. I put a bullet from an eight-bore rifle through its brain,
whereon it sank, as I guessed, stone dead to the bottom of the channel,
thus helping to increase the barricade by the bulk of its great body.
Also it had another effect. I have observed that sea-cows cannot bear
the smell and taint of blood, which frightens them horribly, so that
they will expose themselves to almost any risk, rather than get it into
their nostrils.

Now, in this still water where there was no perceptible current, the
blood from the dead bull soon spread all about so that when the herd,
following their leader, began to arrive they were much alarmed. Indeed,
the first of them on winding or tasting it, turned and tried to get
back up the channel where, however, they met others following, and
there ensued a tremendous confusion. They rose to the surface, blowing,
snorting, bellowing and scrambling over each other in the water, while
continually more and more arrived behind them, till there was a perfect
pandemonium in that narrow place.

All our