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nature, and who expose then in certain brilliant mathematic laws, enhanced by the attraction of difficulties overcome, and of secrets unveiled. Vain efforts! They are only deceiving mirages. Ten, twenty, thirty years of observation dissipate them, and demonstrate their insufficiency and falsity. It is observation alone. Observe! Always observe! Do not leave a single corner of the globe without the minute observations of travelling and of resident geologists; and then we can generalize, and the mysteries of our planet will be unveiled and systematized in a synthesis, solid, logical with facts, well balanced and truly philosophical.

the american naturalist

Geology of Montana<i>Preliminary Report of United States Survey of Montana Portions of Adjacent Territories; Being a Fifth Report of Progress.</i>F. V. Hayden

Geology of MontanaPreliminary Report of United States Survey of Montana Portions of Adjacent Territories; Being a Fifth Report of Progress.F. V. Hayden