Geological sketches

I. America the old world.

II. The Silurian beach.

III. The fern forests of the carboniferous period.

IV. Mountains and their orgin.

V. The growth of continents.

VI. The geological middle age.

VII. The tertiary age, and its characteristic animals.

VIII. The formation of glaciers.

IX. Internal structure and progression of glaciers.

X. External appearance of glaciers.

Glacial period.

The parallel roads of Glen Roy, in Scotland.

Ice-period in America.

Glacial phenomena in Maine.

Physical history of the valley of the Amazons.