me that he knew of a tribe located near the head of one of the tributaries of the Orinoco, whom he had once visited on a trading expedition, and, as I judged that the district should be rich in the material of which I was in search, I decided to visit it.
"It was tedious working up that everlasting stream; hot, too, for there was seldom a breeze, and sometimes it seemed to me that the dome of humidity rising from that sluggish river acted as a lens, or burning glass, to focus upon us the rays of that withering sun. My crews turned out well; a few had the fever, but what surprised me was that Frederick seemed to suffer from the heat more than any of us. Yet he was a useful man—a good driver, although it seemed to me at times that he was unnecessarily abusive.
"Once we entered the tributary, the , it was much better, for there we could keep in the shade of the great forest which rose right from the banks. I had already secured quite a number of specimens, and was alto-
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