It was a most extraordinary place.  One of the peculiarities was that, instead of being pitchy dark, as one would naturally expect it to be in such a place, the whole interior was suffused with a very soft greenish twilight, quite strong enough, when one's eyes became accustomed to it, to permit one to see from one end of the cavern to the other with quite tolerable distinctness.  Where the light came from it was impossible to say, for the roof of the cavern appeared to be formed, like the walls, of solid rock; but from the fact that shafts of light were plainly visible overhead, issuing from the walls and roof, I conjectured that the light entered the cavern through rifts in the rock, and that its greenish tinge was imparted to it by the foliage through which it filtered prior to its passage through the rifts.  Greater surprise was in store, for presently I discovered that the walls were literally covered with sculptured figures of men and animals, done in high relief, and about life-size.  The sculptures appeared to be records of hunting and fighting episodes, and were executed with great vigour and skill. In reply to my astonished enquiries, Lotta informed me that Ricardo attributed this work to the original Caribs, and very probably he was right.