om the extension of the self-governing
principle. What we have to thank them for is the frankness with which
they have betrayed their hostility to us and our cause, under
circumstances which showed that they would ruin us, if it could be done
safely and decently. We shall never be good friends again, it may be
feared, until we change our eagles into sovereigns, or they change their
sovereigns for a coin which bears the head of Liberty. But in the mean
time it is a great step in our education to find out that a new order of
civilization requires new modes of thought, which must, of necessity,
shape themselves out of our conditions. Thus it seems probable, that, as
the first revolution brought about our industrial independence of the
mother-country, not preventing us in any way from still availing
ourselves of the skill of her trained artisans, so this second civil
convulsion will complete that intellectual independence towards which we
have been growing, without cutting us off from whatever in knowledge or
art is the common property of Republics and Despotisms.

* * * * *

REVIEWS AND LITERARY NOTICES.

_Heat considered as a Mode of Motion_; being a Course of Twelve Lectures
delivered at the Royal Institution of Great Britain, by JOHN TYNDALL,
F.R.S., Professor of Natural Philosophy in the Royal Institution. New
York: D. Appleton & Co.

The readers of the "Glaciers of the Alps" have made the acquaintance of
Professor Tyndall as an Alpine adventurer, with a passion for frost and
philosophy, and a remarkable ability both in describing his
mountain-experiences and in explaining the interesting phenomena which
he there encountered. All who have read this inimitable volume will
testify to its rare attractions. It is at once dramatic and philosophic,
poetic and scientific; and the author wins our admiration alike as a
daring and intrepid explorer, a keen observer, a graphic delineator,
and an acute and original investigator.

In the new work on Heat we are introduced to Professor Tyndall upon the
lecturing-platform, where he follows up some of the inquiries started in
the "Glaciers" in a systematic and comprehensive manner. His problem is,
the nature and laws of Heat, its relation to other forms of force, and
the part it plays in the vast scheme of the universe: an imposing task,
but executed in a manner worthy of the gifted young successor of Faraday
as Professor of Natural Philosophy in