[695] over the whole continent from north to south. Among the facts already known from the southern hemisphere are the so-called rivers of stone in the Falkland Islands, which attracted the attention of Darwin during his cruise with Captain Fitzroy, and which have remained an enigma to this day. I believe it will not be difficult to explain their origin in the light of the glacial theory, and I fancy they may turn out to be ground moraines similar to the ‘horsebacks’ in Maine. You may ask what this question of drift has to do with deep-sea dredging? The connection is closer than may at first appear. If drift is not of glacial origin, but is the product of marine currents, its formation at once becomes a matter for the Coast Survey to investigate. But I believe it will be found in the end, that so far from being accumulated by the sea, the drift of the Patagonian lowlands has been worn away by the sea to its present outline, like the northern shores of South America and Brazil. ...This is not the place for a detailed account of the voyage of the Hassler, but enough may be told to show something of Agassiz's own share in it. A journal of scientific and personal experience, kept by Mrs. Agassiz under
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