"Oppressive, almost fearful, is the silence and gloom of the Brazilian forest," says Bates. "The few sounds of birds are of that pensive or mysterious character which intensifies the feeling of solitude, rather than imparts a sense of life and cheerfulness. Sometimes, in the midst of the stillness, a sudden yell or scream will startle one. This comes from some defenceless fruit-eating animal, which is pounced upon by a tiger-cat or stealthy boa-constrictor. Morning and evening howling monkeys make a most fearful and harrowing noise, under which it is difficult to keep up one's buoyancy of spirit. The feeling of inhospitable wildness which the forest is calculated to inspire, is increased tenfold under this fearful uproar. Often, even in the still hours of mid-day, there is a sudden crash, resounding afar through the wilderness, as some great bough or entire tree falls to the ground. Sometimes a sound is heard like the clang of an iron bar against a hard hollow tree, or a piercing cry rends the air. These are not repeated, and the succeeding silence tends to heighten the unpleasant impression which they make on the mind. The natives believe it is the curupira-- the wild man of the forest--who produces all the noises they are unable to explain. He is a mysterious being,--sometimes described as a kind of orang-outang, covered with long shaggy hair, and living in trees; at others, he is said to have cloven feet and a bright red face. He has a wife and children, who, as well as himself, come down to the plantations to steal the mandioca." Such is a faint outline of some of the more prominent features of the great Amazonian Valley--the most interesting portion of the southern half of the New World. No verbal descriptions can do justice to the reality--although drawn, as some of the above are, by master hands. We will next range along the mighty Cordilleras to the ancient kingdom of the Incas, looking down on the Pacific shores; and then, again descending from the mountain heights, take a brief glance at the debased human beings who people the valley, and pass in review the more interesting of the countless wild creatures which inhabit its forests and waters. Afterwards we will traverse Venezuela, Guiana, the rest of the Brazils, and the wide-spreading level regions to the south of that vast country, the river-bound province of Paraguay, the territories of the Argentine Republic, the wild district of the Gran Chaco, the far-famed Pampas, and the plains of Patagonia. PART THREE, CHAPTER FIVE. THE CORDILLERAS.