The seas form so large a part of the environment of mankind that the reasoned description of their great area and contents is a subject of the very first importance. The main features of the seas and oceans of the globe affect human life and its problems in endless ways. The oceans exercise a profound influence over climate and vegetation, the possibilities of cultivation and human settlement. Oceanic movements, both tidal and non-tidal, affect the harbours of the globe and our maritime intercourse, and had still more intimate bearings on that intercourse in the days before the introduction of steam as a means of the propulsion of vessels and the era of great engineering feats such as ship-canal construction. These movements also affect the migrations of fish and cetacea, and so influence fisheries and the growth of sea-power.

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