The real inhabitants of the sea are beneath the surface and every part is tenanted, so completely tenanted that the ocean produces greater bulk of life, area for area, than does the solid land; and every atom of this life is as keen to live and follows as completely the law of its existence as does the life of the interiors of the continents. The vast meadows of plankton and nekton, albeit largely of organisms microscopic, form a layer for hundreds of feet beneath the surface and on which the great herbivora feed; and on these animals the legions of the carnivora subsist. Every vertical region has its life, peculiar to it, extending even to the bottoms of the depths in the world-slimes and the darkness; and in these deeps the falling remains of the upper realms, like gentle primeval rains, afford a never-failing, never-ending source of food and maintain the slow life in the bottoms. We think of the huge animals of the sea when we think of mass, and it is true that the great whales are the bulkiest creatures we know to have lived; yet it is the bacteria, the desmids, the minute crustaceans, and many other diminutive forms that everywhere populate the sea from the equator to the poles and provide the vast background of the ocean life. In these gulfs of moving unseen forms nitrification proceeds, and the rounds of life go on unceasingly. The leviathan whale strains out these minute organisms from the volumes of waters, and so full of them may be his maw that his captors remove the accumulation with spades. The rivers bring down their freight of mud and organic matter, and supply food for the denizens of the sea. The last remains of all these multitudes are laid down on the ocean floors as organic oozes; and nobody knows what part the abysmal soil may play in the economy of the plant in some future epoch. The rains of the land come from the sea; the clouds come ultimately from the sea; the trade-winds flow regularly from the sea; the temperatures of the land surface are controlled largely from the sea; the high lands are washed into the sea as into a basin; if all the continents were levelled into the sea still would the sea envelop the planet about two miles deep. Impurities find their way into the sea and are there digested into the universal beneficence. We must reckon with the sea. It is supposed that the first life on the earth came forth where the land and the waters join, from that eternal interplay of cosmic forces where the solid and the fluid, the mobile and the immobile, meet and marry. Verily, the ancestral sea is the background of the planet. Its very vastness makes it significant. It shows no age. Its deeps have no doubt existed from the solidification of the earth and they will probably remain when all works of man perish utterly.