, drawing to its use all
the data, the relations of which the newly-fledged fact-seeker may
but dimly perceive without its aid.... To the old chemists, Prof.
Cooke's treatise is like a message from beyond the mountain. They
have heard of changes in the science; the clash of the battle of
old and new theories has stirred them from afar. The tidings, too,
had come that the old had given way; and little more than this
they knew.... Prof. Cooke's 'New Chemistry' must do wide service
in bringing to close sight the little known and the longed for....
As a philosophy it is elementary, but, as a book of science,
ordinary readers will find it sufficiently advanced."--_Utica
Morning Herald._

VII.

The Conservation of Energy.

By BALFOUR STEWART, LL. D., F.R.S.

_With an Appendix treating of the Vital and Mental Applications of the
Doctrine._

1 vol., 12mo. Cloth. Price, $1.50.

"The author has succeeded in presenting the facts in a clear and
satisfactory manner, using simple language and copious illustration in
the presentation of facts and principles, confining himself, however,
to the physical aspect of the subject. In the Appendix the operation
of the principles in the spheres of life and mind is supplied by the
essays of Professors Le Conte and Bain."--_Ohio Farmer._

"Prof Stewart is one of the best known teachers in Owens College in
Manchester.

"The volume of THE INTERNATIONAL SCIENTIFIC SERIES now before us is an
excellent illustration of the true method of teaching, and will well
compare with Prof. Tyndall's charming little book in the same series
on 'Forms of Water,' with illustrations enough to make clear, but not
to conceal his thoughts, in a style simple and brief."--_Christian
Register, Boston_.

"The writer has wonderful ability to compress much information into a
few words. It is a rich treat to read such a book as this, when there
is so much beauty and force combined with such simplicity."--_Eastern
Press._

VIII.

Animal Locomotion;

Or, WALKING, SWIMMING, AND FLYING.

_With a Dissertation on Aeronautics._

By J. BELL PETTIGREW, M.D., F.R.S., F.R.S.E., F.R.C.P.E.

1 vol., 12mo. Price, $1.75.

"This work is more than a contribution to the stock of entertaining
knowledge, though, if it only pleased, that would be sufficient excuse
for its publication. But Dr. Pettigrew has given his time t