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THE

AMERICAN NATURALIST,

Anllustrated Magazine

OF

NATURAL HISTORY.

EDITED BY

E. D. COPE AND J. S. KINGSLEY,

ASSISTED BY

DR. C. O. WHITMAN, DR. C. E. BESSEY, H. C MERCER, PROF. C. M. WEED,
PROF. W. S. BAYLEY, PROF. E. A. ANDREWS, PROF. A. C. GILL,
PROF. H. C. WARREN, ERWIN F. SMITH.

VOLUME XXX.

PHILADELPHIA, U. S. A.

THE EDWARDS & DOCKER CO.,

518 & 520 MINOR STREET,

1896.

LIBRARY OF THE

LELAND STANFORD JR. UNIVERSITY.

A.37199

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The Bearing of the Origin and Differentiation of the Sex Cells in
Cymatogaster on the Idea of the Continuity of the Germ Plasm.
CARL H. EIGENMANN

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265

554

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