contain five flesh-coloured eggs, streaked in zig-zag with dark brown lines. Among the other waders are a snow-white heron, another ash-coloured, and a large white stork. The ash-coloured herons are always in pairs—the white always singly, standing quiet and alone on the edge of the water, or half hidden in the green capim. The trees and bushes are full of small warbler-like birds. The most numerous and interesting is one which builds a very extraordinary nest, considering the size of the bird. It is known among the country people by the name of pedreiro, or the forneiro—both names referring to the nature of its habitation. This singular nest is built of clay, and is as hard as stone—pedra; while it is the shape of the mandioca oven—forno—in which the country people prepare their farina. It is about a foot in diameter, and stands edgewise upon the branch or crotch of a tree. Among the smaller birds are bright tanagers, and a species resembling the canary. Humming-birds are scarce, though here and there a few appear; while countless numbers of parrots and parrakeets fly overhead in dense crowds, at times drowning every other sound with their noisy clatter.
Birds of prey are not wanting. Among them is the red hawk, about the size of a kite—and so tame, that even when a canoe passes under the branch on which he is sitting, he does not fly away.
Among the most striking are the gallinaceous birds. The commonest is the cigana, to be seen in groups of fifteen or twenty perched on trees overhanging the water, and feeding upon berries. At night they roost in pairs; but in the daytime are always in larger companies. In appearance they have something of the character of both the pheasant and peacock, and yet do not closely resemble either. With the exception of some small partridge-like gallinaceous birds, the representatives of this family in Brazil belong to types which do not exist in any other parts of the world. Here the curassow, the jacu, the jacami, and the unicorn resemble as much the bustard and other ostrich-like birds as the hen and pheasant.
The most numerous insects to be met with are dragonflies; some with crimson bodies, black heads, and burnished wings; others with large, green bodies, crossed by blue bands.
The Campos.
Although the forests cover generally the whole length and breadth of the Amazonian Valley, there are here and there, on the higher ground, open dry plains with scanty vegetation,—the ground in the water-courses or gullies, formed of clay, being baked by the heat of the sun into slate-like masses. One of these spots we now reach. The most prominent plants of this sandy or clayey region are clusters of cacti and curua palms—a kind of stemless, low palm, with broad leaves springing, vase-like, from the ground. Here also grow wild pineapples; and in broad sunlight numerous humming-birds delight to sport and feed upon the blossoms of the various plants which find no room to bloom in the darker shades of the forest.
Geology of the Amazonian Valley.
Professor Agassiz remarks that no formation—known to geologists—resembling that of the Amazon exists on the face of the earth. Its extent is stupendous. It stretches from the Atlantic shore through the whole width of Brazil into Peru, to the very foot of the Andes—one vast extent of red sandstone, capped by a yellow-ochred clay; not only along the banks of the main river, but forming the sides of those of its tributaries, to their far-off sources, probably over the whole basin of the Paraguay and the Rio de la Plata. How are these vast deposits formed? is the question. The easiest answer, he observes, and the one which most readily suggests itself, is that of a submersion of the continent at successive periods—to allow the accumulation of these materials—and its subsequent elevation. This explanation is rejected, for the simple reason that the deposits show no signs whatever of a marine origin. No sea-shells, or remains of any marine animal, have as yet been found throughout their whole extent—over a region several thousands of miles in length, and from five to seven hundred miles in width. It is evident, he considers, that this basin was a fresh-water basin, these deposits fresh-water deposits. It is true that calcareous layers thickly studded with shells have been found interspersed with the clay; but though supposed to be marine fossils, he recognised them for what they really are—fresh-water shells of the family of the Naiades. As their resemblance is very remarkable, the mistake as to their true zoological character is natural: indeed, many travellers have confounded some fresh-water fishes from the Upper Amazon of the genus of Pterophyllum with the marine genus Platax. He considers that the immense glacier which probably existed at the same time that ice, thousands of feet thick, covered the centre of Europe, must have been formed in this valley, and then, ploughing its bottom over and over again, and grinding all the materials beneath it into a fine powder, must ultimately have forced its way through the colossal sea-wall which it had built up eastward into the Atlantic.