The history of the sea virtually comprises the history of adventure, conquest, and commerce, in all times, and might almost be said to be that of the world itself. We cannot think of it without remembering the great voyagers and sea-captains, the brave naval commanders, the pirates, rovers, and buccaneers of bygone days. Great sea-fights and notable shipwrecks recur to our memory—the progress of naval supremacy, and the means by which millions of people and countless millions of wealth have been transferred from one part of the earth to another. We cannot help thinking, too, of “Poor Jack” and life before the mast, whether on the finest vessel of the Royal Navy, or in the worst form of trading ship. We recall the famous ships themselves, and their careers. We remember, too, the “toilers of the sea”—the fishermen, whalers, pearl-divers, and coral-gatherers; the noble men of the lighthouse, lifeboat, and coastguard services. The horrors of the sea—its storms, hurricanes, whirlpools, waterspouts, impetuous and treacherous currents—rise vividly before our mental vision. Then there are the inhabitants of the sea to be considered—from the tiniest germ of life to the great leviathan, or even the doubtful sea-serpent. And even the lowest depths of ocean, with their mountains, valleys, plains, and luxurious marine vegetation, are full of interest; while at the same time we irresistibly think of the submerged treasure-ships of days gone by, and the submarine cables of to-day. Such are among the subjects we propose to lay before our readers. THE SEA, as one great topic, must comprise descriptions of life on, around, and in the ocean—the perils, mysteries, phenomena, and poetry of the great deep. The subject is too vast for superfluous detail: it would require as many volumes as a grand encyclopædia to do it justice; whilst a formal and chronological history would weary the reader. At all events, the present writer purposes to occasionally gossip and digress, and to arrange facts in groups, not always following the strict sequence of events. The voyage of to-day may recall that of long ago: the discovery made long ago may be traced, by successive leaps, as it were, to its results in the present epoch. We can hardly be wrong in believing that this grand subject has an especial interest for the English reader everywhere; for the spirit of enterprise, enthusiasm, and daring which has carried our flag to the uttermost parts of the earth, and has made the proud words “Britannia rules the waves” no idle vaunt, is shared by a very large proportion of her sons and daughters, at home and abroad. Britain’s part in the exploration and settlement of the whole world has been so pre-eminent that there can be no wonder if, among the English-speaking races everywhere, a peculiar fascination attaches to the sea and all concerning it. Countless thousands of books have been devoted to the land, not a tithe of the number to the ocean.