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THE

AMERICAN NATURALIST,

A. Hllustrated 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,

LIBRARY OF THE LELAND STANFORD JR. UNIVERSITY.

a.37199

CONTENTS.

89

9
17

24

101

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

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

Variation After Birth. L. H. BAILEY.

A Comparative Study of the Point of Acute Vision in the Vertebrata

(Illustrated). J. R. SLONAKER

The Formulation of the Natural Sciences. E. D. COPE .........

Some Localities for Laramie Mammals and Horned Dinosaurs (Illus-

trated). J. B. HATCHER

The History and Principles of Geology, and Its Aim. J. C. HARTZELL,

JR ............

......... 177, 271,

The Constancy of Bacterial Species in Normal Fore Milk. H. L. BOL-

LEY...

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 Disturbed 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....

The Plant Geography of Germany. Roscoe POUND..

The Classification of Diatoms. C. J. ELMORE

The Oldest Civilized Man (Illustrated). E. D. COPE.........

The Role of Acid in the Digestion of Certain Rhizopods. J. C. Hem-

METER......

The Bacterial Diseases of Plants : A Critical Review of the Present

State of Our Knowledge. E. F. SMITH ...............626, 716, 796,

The Meaning and Structure of the So-called "Mushroom Bodies” of

554

379
536

........

the Hexapod Brain. F. C. Kenyon.........
Prof. Baldwin's “ New Factor in Evolution.” HERBERT NICHOLS.....

643
697

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