WITH A LECTURE ON THE STUDY OF BIOLOGY.

BY THOMAS H. HUXLEY.

"Naturæ leges et regulæ, secundum quas omnia fiunt et ex unis formis in alias mutantur, sunt ubique et semper eadem."
B. De Spinoza, Ethices, Pars tertia, Præfatio.

London:
MACMILLAN AND CO.
1877

LONDON:
R. CLAY, SONS, AND TAYLOR, PRINTERS,
BREAD STREET HILL,
QUEEN VICTORIA STREET.


CONTENTS.

I. [THREE LECTURES ON EVOLUTION.] (New York, September 18, 20, 22, 1876).

[LECTURE I.] The Three Hypotheses respecting The History of Nature

[LECTURE II.] The Hypothesis of Evolution. The Neutral and the Favourable Evidence

[LECTURE III.] The Demonstrative Evidence of Evolution

II. [AN ADDRESS ON THE OCCASION OF THE OPENING OF THE JOHN HOPKINS UNIVERSITY] (Baltimore, September 12, 1876)

III. [A LECTURE ON THE STUDY OF BIOLOGY, IN CONNECTION WITH THE LOAN COLLECTION OF SCIENTIFIC APPARATUS.] (South Kensington Museum, December 16, 1876)