AMERICAN ADDRESSES.

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.

D. APPLETON AND COMPANY,

1, 3, AND 5 BOND STREET.

1890.