TABLE OF CONTENTS.

ARTICLE I. (358.) THE CONSTANTS OF NATURE. Part IV. ATOMIC

WEIGHT DETERMINATIONS: A DIGEST OF THE INVESTIGA-

TIONS PUBLISHED SINCE 1814. By GEORGE F. BECKER.

1880. Pp. 152.

ARTICLE II. (441.) THE CONSTANTS OF NATURE. Part V. A RECAL-

CULATION OF THE ATOMIC WEIGHTS. By FRANK WIGGLES-

WORTH CLARKE. 1882. Pp. 293.

ARTICLE III. (437.) CHECK LIST OF PUBLICATIONS OF THE SMITHSONIAN

INSTITUTION, December, 1881. 1881. Pp. 22.

ARTICLE IV. (478.) CATALOGUE OF PUBLICATIONS OF THE SMITHSONIAN

INSTITUTION (1846-1882) WITH AN ALPHABETICAL INDEX

OF ARTICLES IN THE SMITHSONIAN CONTRIBUTIONS TO

KNOWLEDGE, MISCELLANEOUS COLLECTIONS, ANNUAL RE-

PORTS, BULLETINS AND PROCEEDINGS OF THE U.S. NATIONAL

MUSEUM, AND REPORT OF THE BUREAU OF ETHNOLOGY.

By WILLIAM J. RHEES. 1882. Pp. 342.

358

THE

CONSTANTS OF NATURE.

PART IV.

ATOMIC WEIGHT DETERMINATIONS:

A DIGEST

OF THE INVESTIGATIONS PUBLISHED SINCE 1814.

BY