For two days they travelled through this zone of verdure, and at length, by the salt smell in the air, became aware that they were nearing the ocean. At times they met Indians, gaudily dressed, with painted faces, and deadly looking weapons; but these, on observing the scarlet mantles of the pair, and receiving the sign on lips and forehead, stepped aside to let them pass. They recognised that these travellers were proceeding eastward by the will of the god, under the vow of silence. Superstition, stronger than greed or cruelty, protected them from the savages of the wilderness. The journey was not dull, in spite of their anxiety and dread of being followed. On every side the forest was full of life, and Dolores was delighted to see the constant flashing of humming-birds, green, red and yellow glories, which darted through the still air like flying gems. Once they saw the yellow hide of a jaguar, black spotted, sleek, and terrible. Jack had nothing but a knife, given to him by Cocom, and regretted that he had not his revolver with him. A knife was but a poor weapon to do battle with such a terrible foe. To their relief, however, the animal only eyed them for a few minutes in startled surprise, and then slunk away among the undergrowth. Other perils from wild animals they had none. Sometimes the whole air would be alive with butterflies. Purple, yellow spotted, azure striped, they fluttered everywhere. One would have thought the flowers were alive, and flew from stem to stem. Peter, as Jack thought, would have been in his element. This forest was the true paradise of butterflies. But they had no time to admire all this skill and fecundity of Nature. Resolutely following the opal sign, they pushed onward through the forest. They saw on all sides the puzzle monkey trees, with their sharp spikes; ombù trees, whose shade is so dense; aloes, whose branches spread outward like the seven-stemmed candlestick of the Revelation; palms, mangoes, wild fig trees; cactus, burning with fleshy scarlet blossoms, and shallow lagunas, swampy pools of water, filled with sedges and rushes and slimy weeds. The din was constant. Monkeys swung themselves from bough to bough overhead, chattered without ceasing; parrots, gay plumaged, harsh voiced, shrieked discordantly in their ears; the roaring of jaguars and pumas sounded faint in the distance, like muffled thunder; and ever rasped the stridulation of restless grasshoppers, unseen but noisy.