Entered according to Act of Congress, in the year 1871, by

CHAS. C. CHATFIELD & Co.,

In the Office of the Librarian of Congress, at Washington, D. C.

NEW HAVEN, CONN.:

THE COLLEGE COURANT PRINT.

Electrotyped by E. B. Sheldon, New Haven, Conn.

CONTENTS.

ON THE PHYSICAL BASIS OF LIFE.

PROF. T. H. HUXLEY, .

CORRELATION OF VITAL AND PHYSICAL FORCES.

PROF. G. F. BARKER, M.D.,

37

AS REGARDS PROTOPLASM-REPLY TO HUXLEY.

JAMES HUTCHISON STIRLING,

ON THE HYPOTHESIS OF EVOLUTION.

PROF. E. D. COPE,

SCIENTIFIC ADDRESSES.

. 73

ON THE METHODS AND TENDENCIES OF PHYSICAL IN-

VESTIGATION.

ON HAZE AND DUST.

ON THE SCIENTIFIC USE OF THE IMAGINATION.

145

PROF. JOHN TYNDALL, LL.D., F.R.S.,

217