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PROFESSOR OF NATURAL PHILOSOPHY AND ASTRONOMY IN YALE COLLEGE

Revised Edition.

INCLUDING THE LATEST DISCOVERIES

NEW YORK:

HARPER & BROTHERS, PUBLISHERS,

329 & 331 PEARL STRE E T,

FRANKLIN SUARE.

Entered accordirg to Act of Congress, in the year 1840, b5

MARSH, CAPEN, LYON, AND WEBB,

in the Clerk's Office of the District Court of Massachusetto.

ADVERTISEMENT

TO THE

REVISED EDITION.

Since the first publication of these Letters, in 1840, the work has passed through numerous editions, and received many tokens of public favor, both as a classbook for schools and as a reading-book for the family circle, The valuable discoveries made in the science within a few years have suggested an additional Letter, which is accordingly annexed to the series in the present revised form, giving a brief but comprehensive notice of all the leading contributions with which Astronomy has of late been enriched.

The form of Letters was chosen on account of the greater freedom it admits, both of matter and of style, than a dress more purely scientific. Thus the technical portion of the work, it was hoped, might be relieved, and the whole rendered attractive to the youthful reader of either sex by interspersing sketches of the master-builders who, in successive ages, have reared the great temple of Astronomy, composing, as they do, some of the most remarkable and interesting specimens of the human race.

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