Excerpt from Text Book of Comparative Geology
A Just conception of the science of geology is scarcely to be gained by the examination of any single country: the outlook must be broad and must, as far as possible, include the whole earth. It is to the use of the comparative method that we owe the striking generalisations of Neumayr and the philosophical views of Suess.
Even in the study of a particular district, comparison with other areas is invaluable; for the key to the geology will often be found in some far distant region. South Devonshire, for example, was very imperfectly understood until Mr. Ussher applied the knowledge which had been won in the Rhenish Mountains.
There is, however, no text book in the English language which affords sufficient help in such comparisons, for there is none which gives an adequate account even of the geology of Europe; and it is with the object of supplying this deficiency, in part at least, that the translation of Dr. Kayser's "Lehrbuch der geologischen Formationskunde' has been undertaken. Dr. Kayser's work was intended primarily for use in Germany; but the space devoted to other countries is much larger than in earlier text books.
In the present edition very considerable additions have been made to the portions descriptive of extra-German countries. These additions are most numerous in the first half of the work, while in the latter half the greatness of the subject and the limits of space have made themselves more severely felt. Extra-European rocks have necessarily received but brief notice.
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