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TH
THIS volume is made up of a number

of unconnected sketches and addresses, coming more or less distinctly under the head of Popular Science. Three of them :- the paper on " The Dispersion of FreshWater Fishes,” the address on “Darwin,” and the paper on “The Evolution of the College Curriculum ” — are here published for the first time. The others have appeared in various periodicals. All the articles have been freely retouched, and some of them entirely rewritten. The author wishes to express his obligations to Messrs. D. Appleton & Co., to S. E. Cassino & Co., and to the Century Company for permission to reprint articles which have appeared in the “Popular Science Monthly,” in the “Standard Natural History,” and in “St. Nicholas."

D. S. J.

UNIVERSITY OF INDIANA,

BLOOMINGTON, August, 1887.

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SCIENCE SKETCHES .

THE STORY OF A SALMON.

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the realm of the Northwest Wind, on the

boundary-line between the dark fir-forests and the sunny plains, there stands a mountain, great white cone two miles and a half in perpendicular height. On its lower mile the dense firwoods cover it with never-changing green; on its next half-mile a lighter green of grass and bushes gives place in winter to white; and on its uppermost mile the snows of the great ice age still linger in unspotted purity. The people of Washington Territory say that their mountain is the great “King-pin of the Universe," which shows that even in its own country Mount Tacoma is not without honor.

Flowing down from the southwest slope of Mount Tacoma is a cold, clear river, fed by the melting snows of the mountain. Madly it hastens down over white cascades and beds of shining sands, through birch-woods and belts of dark firs, to mingle its waters at last with those of the great Columbia. This river is the Cowlitz; and on its bottom, not many years ago, there lay half buried

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