Of land shells I saw but one creeping along the reeds; and of water shells I gathered only a few small Ampullariae. Having ascended the river to a point nearly on a line with the serra, I landed, and struck across the Campos on foot. Here I entered upon an entirely different region,--a dry, open plain, with scanty vegetation. The most prominent plants were clusters of cactus and curua palms, a kind of stemless, low palm, with broad, elegant leaves springing vase-like from the ground. In these dry, sandy fields, rising gradually toward the serra, I observed in the deeper gullies formed by the heavy rains the laminated clays which are everywhere the foundation of the Amazonian strata. They here presented again so much the character of ordinary clay slates, that I thought I had at last come upon some old geological formation. Instead of this I only obtained fresh evidence that, by baking them, the burning sun of the tropics may produce upon laminated clays of recent origin the same effect as plutonic agents have produced upon the ancient clays, that is, it may change them into metamorphic slates. As I approached the serra, I was again reminded how, under the most dissimilar circumstances, similar features recur everywhere in nature. I came suddenly upon a little creek, bordered with the usual vegetation of such shallow water-courses, and on its brink stood a sand-piper, which flew away at my approach, uttering its peculiar cry, so like what one hears at home that, had I not seen him, I should have recognized him by his voice. After an hour's walk under the scorching sun, I was glad to find myself at the hamlet of Errere, near the foot of the serra, where I rejoined my companions. It was already noon, and they had arrived some time before. They had, however, waited breakfast for me, to which we all brought a good appetite. Breakfast over, we slung our hammocks under the trees, and during the heat of the day enjoyed the rest which we had so richly earned. FOOTNOTES: [C] The name consecrated by De Saussure to designate certain rocks in Switzerland, which have had their surfaces rounded under the action of the glaciers. Their gently swelling outlines are thought to resemble sheep resting on the ground, and for this reason the people in the Alps call them _roches moutonnees_. [D] The atlas in Martins's "Journey to Brazil," or the sketch accompanying Bates's description of these hills in his "Naturalist on the Amazons," will give an idea of their aspect. A BUNDLE OF BONES.