THE work consists of translations from the German originals of two memoirs, published respectively in 1883 and 1886, with explanatory notes on the geology by the Survey officers. Ettingshausen's ...
WITH regard to the succession of races which have undergone a complete specific change through successive geological periods, we have not in plants, in as far as I am aware, any such cases of “true ...
I. America the old world.--II. The Silurian beach.--III. The fern forests of the Carboniferous period.--IV. Mountains and their origin.--V. The growth of continents.--VI. The geological middle ...
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