The blacks themselves never inquired how the fish came into these inland holes; it was enough for them to know they were there and were good eating.

The usual fish-hooks were of bone; and although I experimented with hooks of gold and copper I found them practically useless, and, in the long run, reverted to articles of native manufacture.

In a certain limestone country, which I struck in the course of my wanderings, I discovered some extraordinary caves with water- holes, in which blind fish existed.

They certainly had indications of eyes, but these were hidden beneath a kind of permanent skin covering.

In any case they would have had no use for eyes, because the water-holes were situated in the most profound darkness.