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That veteran man of science, Sir John Murray, has in a recent paper (Royal Geographical Society’s Journal, October 1899) published his presidential address to the geographical section of the British Association at Dover, and even to the ordinary non-scientific reader his wonderful résumé of what has been done in the way of exploring the ocean’s depths must be as entrancing as a fairy tale. The mere mention of such a chasm as that existing in the South Pacific between the Kermadecs and the Friendly Islands, where a depth of 5155 fathoms, or 530 feet more than five geographical miles, has been found, strikes the lay mind with awe. Mount Everest, that stupendous Himalayan peak whose summit soars far above the utmost efforts of even the most devoted mountaineers, a virgin fastness mocking man’s soaring ambition, if sunk in the ocean at the spot just mentioned would disappear until its highest point was 2000 feet below the surface. Yet out of that abyss rises the volcanic mass of Sunday Island in the Kermadecs, whose crater is probably 2000 feet above the sea-level. But in no less than forty-three areas visited by the Challenger, depths of over 3000 fathoms have been found, and their total area is estimated at 7,152,000 square miles, or about 7 per cent. of the total water-surface of the globe. Within these deeps are found many lower deeps, strangely enough generally in comparatively close proximity to land, such as the Tuscarora Deep, near Japan, one in the Banda Sea, that is to say, in the heart of the East India Archipelago, &c. Down, down into these mysterious waters the ingenious sounding-machine runs, taking out its four miles and upwards of pianoforte wire until the sudden stoppage of the swift descent marks the dial on deck with the exact number of fathoms reached. And yet so vast is the ocean bed that none can say with any certainty that far greater depths may not yet be found than any that have hitherto been recorded, amazing as they are.