the opening of the Amazons, which have done more, perhaps, than anything else of late years to attract attention to the subject. There are points where the researches of the statesman and the investigator meet, and natural science is not without its influence, even on the practical bearings of this question. Shall this region be legislated for as sea or land? Shall the interests of agriculture or navigation prevail in its councils? Is it essentially aquatic or terrestrial? Such were some of the inquiries which came up in the course of the discussion. A region of country which stretches across a whole continent, and is flooded for half the year, where there can never be railroads, or highways, or even pedestrian travelling, to any great extent, can hardly be considered as dry land. It is true that, in this oceanic river system, the tidal action has an annual, instead of a daily, ebb and flow; that its rise and fall obey a larger light, and are regulated by the sun, and not the moon; but it is nevertheless subject to all the conditions of a submerged district, and must be treated as such. Indeed, these semiannual changes of level are far more powerful in their influence on the life of the inhabitants than any marine tides. People sail half the year over districts where, for the other half, they walk, though hardly dry-shod, over the soaked ground; their occupations, their dress, their habits, are modified in accordance with the dry and wet seasons. And not only the ways of life, but the whole aspect of the country, the character of the landscape, are changed. At this moment there are two most picturesque falls in the neighborhood of Manaos,--the Great and Little Cascades, as they are called,--favorite resorts for bathing, picnics, etc., which, in a few months, when the river shall have risen above their highest level, will have completely disappeared. Their bold rocks and shady nooks will have become river-bottom. All that one hears or reads of the extent of the Amazons and its tributaries does not give one an idea of its immensity as a whole. One must float for months upon its surface, in order to understand how fully water has the mastery over land along its borders. Its watery labyrinth is not so much a network of rivers, as an ocean of fresh water cut up and divided by land, the land being often nothing more than an archipelago of islands in its midst. The valley of the Amazons is indeed an aquatic, not a terrestrial, basin; and it is not strange, when looked upon from this point of view, that its forests should be less full of life, comparatively, than its rivers.