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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.

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CONTENTS.

On Heredity and Rejuvenation. C. S. MINOT...

Lost Characteristics. A. HYATT................

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LEADING ARTICLES.

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JAN 12 109%

Life Before Fossils. CHARLES MORRIS...................

.........188,

Birds of New Guinea (Continued from p. 1065, Vol. XXIX). G. S.

MEAD

.........195,

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

The Probable Influence of Dist rbed Nutrition on the Evolution of
the Vegetative Phase of the Sporophyte. G. F. ATKINSON
Progress in American Ornithology, 1886-1895. R. W. SHUFELDT....................
The Path of the Water Current in Cucumber Plants. E. F. SMITH.
372, 451,

On the Mississippi Valley Unionidæ Found in the St. Lawrence and
Atlantic Drainage Areas. C. T. SIMPSON

A New Factor in Evolution. J. MARK BALDWIN .......................................................441,

Extensive Migration of Birds as a Check Upon the Production of Geo-
graphical Varieties. T. H. MONTGOMERY....

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The Plant Geography of Germany. ROSCOE POUND..........................................
The Classification of Diatoms. C. J. ELMORe .

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