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differed from its predecessor; but I shall not attempt to offer the reader such a summary in the present case, fearing that that would prove tediously long. *

A full index is given in this as in former editions, and the student will observe that all the organic remains of which there are woodcut figures in the text are printed in italics in the index.

CHARLES LYELL.

63 HARLEY STREET, LONDON,

December 20, 1864.

* As it is impossible to enable the reader to recognize rocks and minerals at sight by aid of verbal descriptions or figures, he will do well to obtain a wellarranged collection of specimens, such as may be procured from Mr. Tennant (149 Strand), teacher of Mineralogy at King's College, London,

CONTENTS.

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