If one asks the Indians why such a continuous noise is heard on certain nights, they answer, with a smile, that “the animals are rejoicing in the beautiful moonlight, and celebrating the return of the full moon.” To me the scene appeared rather to be owing to an accidental, long-continued, and gradually increasing conflict among the animals. Thus, for instance, the jaguar will pursue the peccaries and the tapirs, which, densely crowded together, burst through the barrier of tree-like shrubs which opposes their flight. Terrified at the confusion, the monkeys on the tops of the trees join their cries with those of the larger animals. This arouses the tribes of birds who build their nests in communities, and suddenly the whole animal world is in a state of commotion. Further experience taught us, that it was by no means always the festival of moonlight that disturbed the stillness of the forest; for we observed that the voices were loudest during violent storms of rain, or when the thunder echoed and the lightning flashed through the depths of the woods. The good-natured Franciscan monk who (notwithstanding the fever from which he had been suffering for many months), accompanied us through the cataracts of Atures and Maypures to San Carlos, on the Rio Negro, and to the Brazilian coast, used to say, when apprehensive of a storm at night, “May Heaven grant a quiet night both to us and to the wild beasts of the forest!” A singular contrast to the scenes I have here described, and which I had repeated opportunities of witnessing, is presented by the stillness which reigns within the tropics at the noontide of a day unusually sultry. I borrow from the same journal the description of a scene at the Narrows of Baraguan. Here the Orinoco forms for itself a passage through the western part of the mountains of the Parime. That which is called at this remarkable pass a Narrow (_Angostura del Baraguan_), is, however, a basin almost 5700 feet in breadth. With the exception of an old withered stem of Aubletia (_Apeiba Tiburbu_), and a new Apocinea (_Allamanda Salicifolia_), the barren rocks were only covered with a few silvery croton shrubs. A thermometer observed in the shade, but brought within a few inches of the lofty mass of granite rock, rose to more than 122° Fahr. All distant objects had wavy undulating outlines, the optical effect of the _mirage_. Not a breath of air moved the dust-like sand. The sun stood in the zenith; and the effulgence of light poured upon the river, and which, owing to a gentle ripple of the waters, was brilliantly reflected, gave additional distinctness to the red haze which veiled the distance. All the rocky mounds and naked boulders were covered with large, thick-scaled Iguanas, Gecko-lizards, and spotted Salamanders. Motionless, with uplifted heads and widely extended mouths, they seemed to inhale the heated air with ecstasy. The larger animals at such times take refuge in the deep recesses