The South American continent, it will thus be seen, consists of several distinctly different descriptions of country:--the long line of the Cordilleras, with their snow-capped peaks and their lofty punas or high table-lands, and the narrow strip of arid soil at their western base; the three separate mountain-systems of Venezuela, Guiana, and the Brazils; the mighty forests bordering the great rivers and their tributaries, to which must be added the wooded heights of the inter-tropical regions, where tall trees, including several palms, flourish at an elevation of many thousand feet above the level of the ocean; and lastly, the wide-extending regions of the Llanos and the Pampas. These, as might be supposed, present great varieties of animal life--though scarcely so great as might have been expected, when it is remembered that they extend from 10 degrees north to 50 degrees south latitude. Several species indeed are found far to the north of the equator, and also near the southern end of the continent. But to give an idea of these different regions, they must be described in detail. PART THREE, CHAPTER THREE. VALLEY OF THE AMAZON. Standing on the eastern spur of the Andes, between 3 degrees and 4 degrees south of the equator, the eye of the traveller may see in imagination a vast valley, clothed with a dense forest, stretching towards the far-distant Atlantic. Behind him, on the west, tower the lofty peaks of the Cordilleras; on his left, in a northerly direction, appear the mountains and highlands of Venezuela and Guiana; while to the south rise the serras and table-lands of the Brazils. It is the Valley of the Amazon, in which more than half of Europe might be contained. Down the centre flows a mighty stream, the tributaries of which alone contain a bulk of water greater than all the European rivers put together.