viit ADVERTISEMENTS. 
The American Geologist for 1891, 
EDITED BY 
Pror. S, Carvin, University of Iowa ; Dr. E. W. CLAYPoLE, prehtel College; Joun Everman, Lafayette College ; 
Dr. Persiror Fraz ER, Franklin Institute ; og re Soe co m Washburn College; deer es L. yoy RICK, 
TPE University; Pror. A. Lakes, Color: of arise Dr. ANDRE’ ON, late 
Geological Sekr i of Canada; E. o. Pa oi pase cal Survey; pated i a 
"Uni 
rsity of West Virginia; DR. ALEX. WincHeELL, University of Michigan 
Pror, N. H. WixcweLL, University of Minneso 
SPECIAL OFFERS TO NEW SUBSCRIBERS. 
For the year 1891 the subscription rate for the GEoLoGist will 
remain at $3.50. Any old subscriber who remits that sum with 
the name of a new subscriber will be entitled to have his own sub- 
scription extended six months. The cost of the numbers for 1888, 
after January Ist, 1891, will be $3.50; those of 1889, $2.50, and 
of 1890, $2.50. New subscribers who remit to us cash in advance 
will receive all back numbers and the subscription for 1891, for | 
$11.00, but this will debar them from the privilege of the follow- 
ing premiums. 
Any new subscriber who remits to us cash in advance may select 
from the following premium list, by which he will receive the se- 
lected book and the Gxonogist at a considerably less rate than he 
could obtain both separately. These are special offers for this 
specific purpose, for which we have made favorable arrangements 
with the various publishers. The works here listed are such as 
every geologist would desire to have in his pees 
orth American Geology and Paleont ology. . MILLER. Recently 
published ; 664 pp., Royal octavo, Hibs illustrations. Regular price, 
$5.00; with the GEOLOGIST for 1891, 
Rand & MoNally’s Standard Atlas of the World. One large volume of 
196 pp, ion nen illustrated, substantially bound, with gold side 
Stamp, revised to 1890. Indispensable to every student. Size o 
rg lobed: 11x14 inches. Regular price, pee deni cloth bind- 
g, $4.50. pie th the GroLoaist for 1891, $5. 
ays a Demonstration of t ore Adam. 
A study oF prii condition, antiquity, racial affinities and progress- 
Ni dispersion over the a With charts and other illustrations. 
ALEXANDER Wisco R 
L. 
ee price, $3.50; with the GEOLOGIST for 1891, $4.7 
World Life, A study of the formation, growth and Nee of worlds, 
from their earliest existence as nebulous masses diffused through 
space to their development in sun and world system s and their final | 
dissolution. By ALEXANDER WINCHELL, LL.D., 1 vol., illustrated | 
—— cloth. Regular price, $2.50; with the Chews for 1891, | 
Sparks from a Geologist’s Hammer. A series of geological essays. BY 
ALEXANDER WINCHELL, LL. D. Second goon illustrated, 12mo. 
ba Regular price, $2.00; with the T epnd for -00. al 
New Essays Cono the Human Salesian ding A critic 
exposition. By PRor ee Dewey, Pu. D. 16mo, 289 pp. Regu 
lar price, $1. 25; with the Gein cies ‘for 1891, $3.75. 
