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Elizabeth Cary Agassiz, Louis Agassiz: his life and correspondence, third edition, Chapter 14: 1846-1847: Aet. 39-40. (search)
navia before joining me here, called my attention at once to certain points of resemblance between the phenomena there and those which I had seen in the neighborhood of Boston. Since then, we have made several excursions together, have visited Niagara, and, in short, have tried to collect all the special facts of glacial phenomena in America. . . . You are, no doubt, aware that the whole rocky surface of the ground here is polished. I do not think that anywhere in the world there exist polis of boulders of divers forms and dimensions. At East Boston you cannot see what underlies this deposit; but no doubt it rests upon a rounded mass of granite, polished and grooved like several others in Boston harbor. . . . In our journey to Niagara, Mr. Desor and I assured ourselves that the river deposits, in which, among other things, the mastodon is found with the fresh-water shells of Goat Island, are posterior to the drift. It is a fact worth consideration that the mastodons found in
Elizabeth Cary Agassiz, Louis Agassiz: his life and correspondence, third edition, Chapter 15: 1847-1850: Aet. 40-43. (search)
ology of Lake Superior, and especially of the system of dykes, by the action of which he found that its bed had been excavated, and the outline of its shores determined. But perhaps the inhabitants of the lake itself occupied him even more than its conformation or its surrounding features. Not only for its own novelty and variety, but for its bearing on the geographical distribution of animals, the fauna of this great sheet of fresh water interested him deeply. On this journey he saw at Niagara for the first time a living gar-pike, the only representative among modern fishes of the fossil type of Lepidosteus. From this type he had learned more perhaps than from any other, of the relations between the past and the present fishes. When a student of nineteen years of age, his first sight of a stuffed skin of a gar-pike in the Museum of Carlsruhe told him that it stood alone among living fishes. Its true alliance with the Lepidosteus of the early geological ages became clear to him