For three days we forged ahead, now clambering along the banks of the swirling torrent, and again crashing through the darkened forest, using our axes energetically. More than once, in the stiller waters between the curves, huge crocodiles were seen disporting themselves cumbrously, and when we approached they fixed their baleful eyes on us, and came steadily on until the Captain stopped their leader by a well-directed bullet. The crocodiles of this region seemed extremely ferocious, and no sooner had one of their number been rendered hors de combat than the horrible carcass was carried off in triumph by a school of the late saurian's neighbours.
"They appear tae have vera healthy appetites," murmured Stewart thoughtfully, as he gazed at the ravenous monsters, after an exhibition of this sort. "A wunner," he continued, addressing Skelton, "if they bastes are affected by the climate?"
"You've got me there, Stewart," replied Skelton, with a laugh; "but they don't seem to need quinine to aid their digestion, anyhow."
Birds of the most beautiful plumage fluttered among the branches, and I had the good fortune to bring down a gorgeous bird of paradise with my rifle. Mac, like the ancient mariner, insisted on carrying this bird round his neck rather than leave it for the tigers and bisons, though he repented of his resolution before he had gone far. Of the wild animals encountered on this march I could write much. Fortunately the lordly tiger seldom met us in an aggressive mood, but we had several experiences with "Old Stripes," nevertheless—at long range; and we were constantly stumbling over squeaking pigs and venomous reptiles of many kinds. Little brown animals of the bear family were especially ubiquitous, so that our time was kept rather fully employed on our long trail towards the supposed land of El Dorado.
As we neared the shadowy mountains, the river-channel narrowed gradually until it formed a deep gorge, in which the swirling waters dashed like the flood of some gigantic mill-race; and we were forced to keep the shelter of the forest rather than risk stumbling into the apparently bottomless abysses.
"I'm afraid we cannot go much farther, boys," I said, when we were struggling through the thicket, steering by compass, and with the river thundering noisily away to our left.
"The gold in the mountains won't help us much if we have to transport our goods over this sort of country," spoke Phil; and there was much truth in his words.
"I have been noticing," remarked Skelton, "that instead of reaching a finer climate we seem to be coming into a very poisonous atmosphere, judging by the odour of the vegetation."
It was certainly strange that the air should continue so dank and depressing at our high altitude, and several times a most extraordinary stench, as of decaying carcasses, would assail our nostrils and cause us to grow faint and sickly. Soon we began to notice that these poisonous vapours were most pungent in the vicinity of certain enormous cactus-like growths which we encountered here and there; but these huge plants looked so picturesque and beautiful that we found it hard to believe that they could taint the air so frightfully.
"It's rather odd," said Skelton doubtfully, "that where these giant spiky lilies grow there is always an open space clear around, as if nothing could live in their presence."