$4.60 per Year (Foreign). 
THE 
AMERICAN 
NATURALIST 
A MONTHLY JOURNAL 
DEVOTED TO THE NATURAL SCIENCES 
IN THEIR WIDEST SENSE. 
EDITED BY 
Dr. ROBERT P. BIGELOW, Boston, 
ASSISTED BY AN EDITORIAL BOARD AND THE FOLLOWING 
ASSOCIATE EDITORS: 
D. H. CAMPBELL, 
J. H. COMSTOCK, 
W. M. DAVIS, 
D, S. JORDAN, 
a; A. ANDREWS, 
BAUR, 
a S. BAYLEY, 
CE BEECHER, 
C. PALACHE ar F SMITH, 
H. M. RICHARDS, "Paa 
W. E. RITTER k Cc. WARREN, 
F: RUSSELL, S/W ires 
35 cts. per Copy. 
X 
Vol. XXXI. ° 
DECEMBER, 1897. 
CONTENTS. 
| Tetropercuy - AR sw 
Ne: EVIEW DEDICATED TO THE 
Late Prorgssor Corr, (Illustrated). 
SSE Henry Fairfield Osborn. 
; ICAL deities IN a G No. 3. 
eorge C. Whipple. 
( pema ) 
E. A. Andrews. 
he ’ 
fAR’S ECTOPLAsMIC LAYER: 
cA 
NORTH American Freso WATER : ELLY FISH 
fo Edward Potts. 
ME eion OF THE ERES 
i CTION OF E PyLoric: CÆCA OF 
hi ERIAS oa Ellen A: Rie 
TC 2 
i En TABLE—Acquired characters—The 
; ton Society of Natural History. - 
_ GENERAL Notes, 
General Biology.—The Ayerage Contribution 
of 
| “te omy Ancestor to the total Heritage 
R E Re T Pree vs. Epigenes. 
1035 
- 1041 
june iý mje New Minerals, Derbylite— 
i Zirkelite—Wellsite, a New Zeolite—Silicate 
Containing en ENE Group—Terres- 
trial Iron from Missou 
Petrography y- Perrographiy of the Marquetté 
Iron Range — R 
ae g m and Rosita Hills District, Clorado 
ican Fossil Brachiopoda. . 
in 
Enbryology—Fertilization- 
- . Psychology—The Physical Basis of 
| Baldwin's Social ul ae beara 
|in Mental Developm 
| Anthropology—The ‘History of Mankind. 
i mest? News. .. 
Pain— 
PHILADELPHIA, U. S. A. 
na ry : a NO am et ag 
d at the Philadelphia Prst Office as second-class matter. 
PE a PAE s , Bynopele of Ames 
chi Bi: 
Botany—Bailey’s Principles of Fruit Gries 
. 103 
PAGI 
Shaya es of og mane Plankton 
1043 
ock-formation of the ` $ 
. 1062 
. 1064 
TEE SDMTARDS & DOCKER co 
518 ano 520 MINOR STREET. 
+ a 
