$4.00 per Year. 
$4.60 per Year (Foreign). 
THE 
AMERICAN 
NATURALIST 
A MONTHLY JOURNAL 
DEVOTED TO THE NATURAL SCIENCES 
IN THEIR WIDEST SENSE. 
NAGING EDIT 
Prors. E. D. COPE, Philadelphia, axnp J. S 
aay Tufts College, College Hill, Mass. 
ASSOCIATE EDITORS: 
35 cts. per Copy. 
Dr. C. O. WHITMAN, Chicag: P BESSEY, Lincoln, Neb., H. by MERCER, Philadelphia, 
Pror. ©. M. WEED. , Durham, Y Ha Pror. W. S. BAYLEY, We Benle Maine, F. E. A. ANDREWS, Baltimore, 
PROF H. HOBBS, Madison, Wis 
. WM. ROMAINE NEW DOL D, Philadelphia, 
Vol. XXIX. MAY, 
1895. No 
. 341 
CON TEN ES. 
PAGE, 
THE BIRDS oF New GUINEA. G. S. Mead. . 409 
THE viet faa! MECHANISM Bu mals THE SEARCH 
THE UNKNOWN FACTORS OF EVOLUTION. 
Hones. Fairfield Osborn. -418 
ON THE PRESENCE OF A TEST FOR 
THE FOSSILIZATION OF ANIMAL Bones. - (Co 
tinued.) . Dr. Thomas W Slon. 439 
THE GENERA OF Be dveniscronhe 
Theodore Gill. 457 
RECENT i ea ores LAORE TDA e Life 
of Ric wen . 459 
RECENT Sik AND SE ESE 460 
GENERAL NOTES. 
Geography and Travels. — The AUR 
Scientific Peere of 1895. -4 
t Books—Flet tcher; The 
als ysis — 
E hives Eohi 
D 
ler] 
Petrography—Granite Inclusions in Gabbro 
<= Geology Pretoria, South Africa— 
The Gabbro of the Adirondacks—The Dy 
housand Is] —Analcite-Diabases 
sa coi cinte nee PASS. from 
Ww isconsin—Not . 470 
Geology and Paleontology —The Lakes of vei 
tral Africa—Structure of Triarthrus — Land 
Canadian Paleozoic—The De- 
Heb an System of Easter Bd anny ee and 
Ney ork—The E nbligh: Tarn 
of Norther China—Geological New 
, Botany—Notes on Mexican Liche 
im 
ess 
s, 1—The 
e Vegetation b 
Division of a aga lo Seer ere Field, Forest, 
and Senn 
Zoology—W cbs Spinning "Spi dersi-Fishes of 
the North weet Queer Misfortunes of Birds— 
The Cotton-Tail ae Zoological. News, 
Mollusea—Crust mtr oni —Pisces— 
car Rene ammalia 
tomology — The Cabbage Root Maggot 
ana = Ohio Dragonflies — A Unique 
ournal—Loss_ by Fire—Male R iain t 
Organs of r ela --Lamp Chimneys for Breed- 
—The Name of the fh eeen or 
Splenic Cattle-Fever Parasite 
Embryology—Ascaris Eggs a 
—Isolated Blastomeres in pefr 
nd Tem perature 
ns—-Frog’s 
Eggs in Eee AE AAE IET RA a artani 
“Psych logy.— ical Res ; 
Archeology a and Biinoo poy- Noles on Yucatan 
—The Potte eel i 5 
CEEDINGS OF SCIENTIFIC SOCIETI 
Sten TIFIC Rowe. 
a scopy C3 iao pii of Cleavage Cells : 
> 513 
GE. 
474 
ae 
5 
PHILADELPHIA; U. S. A. 
THE EDWARDS & DOCKERCO., 
518 ano 520 MINOR STREET. 
4 Entered at the Philadelphia Post Office as second-class matter. 
