Part 1

HALF HOURS

WITH

MODERN SCIENTISTS.

LECTURES AND ESSAYS

PROFS. HUXLEY, BARKER, STIRLING, COPE AND TYNDALL.

WITH

A GENERAL INTRODUCTION

NOAH PORTER, D.D., LL.D.,

PRESIDENT OF YALE COLLEGE.

FIRST SERIES.

NEW HAVEN, CONN.: CHARLES C. CHATFIELD & CO., 1872.

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──────────────────────────── Entered according to act of Congress, in the year 1872, by

CHARLES 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.

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CONTENTS.

GENERAL INTRODUCTION. BY PREST. PORTER, v

ON THE PHYSICAL BASIS OF LIFE. 1 PROF. T. H. HUXLEY,

CORRELATION OF VITAL AND PHYSICAL 37 FORCES. PROF. G. F. BARKER, M.D.,

AS REGARDS PROTOPLASM—REPLY TO HUXLEY. 73 JAMES HUTCHISON STIRLING,

ON THE HYPOTHESIS OF EVOLUTION. 145 PROF. E. D. COPE,

SCIENTIFIC ADDRESSES.

ON THE METHODS AND TENDENCIES OF 219 PHYSICAL INVESTIGATION,

ON HAZE AND DUST, 234

ON THE SCIENTIFIC USE OF THE 247 IMAGINATION,