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272 would put us in their power if they were treacherously disposed. We kept our independence, therefore, and had our weapons ready for any emergency, while preserving the most friendly relations. We also continually visited their caves, which were most remarkable places, though whether made by man or by Nature we have never been able to determine. They were all on the one stratum, hollowed out of some soft rock which lay between the volcanic basalt forming the ruddy cliffs above them, and the hard granite which formed their base.

The openings were about eighty feet above the ground, and were led up to by long stone stairs, so narrow and steep that no large animal could mount them. Inside they were warm and dry, running in straight passages of varying length into the side of the hill, with smooth grey walls decorated with many excellent pictures done with charred sticks and representing the various animals of the plateau. If every living thing were swept from the country the future explorer would find upon the walls of these caves ample evidence of the strange fauna—the dinosaurs, iguanodons, and fish lizards—which had lived so recently upon earth.

Since we had learned that the huge iguanodons were kept as tame herds by their owners, and were simply walking meat-stores, we had conceived that man, even with his primitive weapons, had established his ascendancy upon the plateau. We were