THE

AMERICAN

JOURNAL OF SCIENCE.

EDITOR: EDWARD S. DANA.

ASSOCIATE EDITORS

PROFESSORS WILLIAM M. DAVIS AND REGINALD A. DALY,
OF CAMBRIDGE,

PROFESSORS HORACE L. WELLS, CHARLES SCHUCHERT,
HERBERT E. GREGORY, WESLEY R. COE AND
FREDERICK E. BEACH, OF NEW HAVEN,

PROFESSOR EDWARD W. BERRY, OF BALTIMORE,
DRS. FREDERICK L. RANSOME AND WILLIAM BOWIE,
OF WASHINGTON.

FIFTH SERIES

VOL. III-[WHOLE NUMBER, CCII].

WITH THREE PLATES

NEW HAVEN, CONNECTICUT.

1922.

Warr
8-28-1922

THE TUTTLE, MOREHOUSE & TAYLOR COMPANY,

NEW HAVEN, CONN.