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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
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
ΙΟΙ
112
The History and Principles of Geology, and Its Aim. J. C. HARTZELL,
JR.........
........177, 271,
177
The Constancy of Bacterial Species in Normal Fore Milk. H. L. BOL-
184
LEY...
Life Before Fossils. CHARLES MORRIS...........................................
Birds of New Guinea (Continued from p. 1065, Vol. XXIX). G. S.
MEAD......
..188,
279
.195,
285
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
Extensive Migration of Birds as a Check Upon the Production of Geo-
graphical Varieties. T. H. MONTGOMERY..............
265
349
357
554
379
The Plant Geography of Germany. ROSCOE POUND..
The Classification of Diatoms. C. J. ELMORE
The Oldest Civilized Man (Illustrated). E. D. COPE.....
616
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
the Hexapod Brain. F. C. KENYON..........
Prof. Baldwin's "New Factor in Evolution." HERBERT NICHOLS.....
619
912
643
697