ELEMENTS OF OPTICS.
By David Brewster.
A new American Edition, with Notes and Additions, by A. D. Bache, Professor of Natural Philosophy and Chemistry in the University of Pennsylvania.
In One Volume, 12mo.
PRELIMINARY DISCOURSE
on the
Objects, Advantages, and Pleasures of the Study of Natural Philosophy.
By J. T. W. Herschel, A.M., late Fellow of St. John's College, Cambridge.