ADVERTISEMENTS. 
Werks: Ramage Use and Abuse. By Wm. Matuews, LL.D. Twentieth - 
; 12mo., cloth, 504 pp. Regular price, $2. 00; with the GEOL- 
ee roe 1891, $4.00. 
Men, Places and Things. By Wm. Maruews, LL.D. Third edition, 1 
vol., 12mo0., 394 pp. anai ‘price, $1.50; with the Grovoetsr for 
1891, $3.75. 
Shall We Teach Geology? By ALEXANDER WINCHELL, LL.D. Should 
be read by all teachers and those interested in educational matters. 
12mo., cloth. Regular price, $1.00; with the GroLogist for 1891, 
$3.50. 
ose eae complete set in twelve volumes; with the GEOLOGIST 
$4.00. 
Sienna "Oval opedia, = Sa yae 2176 pp., 620 illustrations; with 
the GEOLOGIST for 1, $4.00 
Gems and Precious ia of No rth America, By GEORGE F. Kunz 
Large quarto, pp. 336, 8 colored plates and numerous minor engrav- 
— ips gilt. Regular price, $10.00; with the GEoLoGIST for 
1891, $11.00, 
Metallurgy of Steel. By Henry M. Hower. “A notable pode 
tion to ungy of Steel of iron and steel eao i ” Royal quarto, 
425 pp., cloth, gilt, profusely — Regular price, $10.00; 
with the Groxoaist for 1891, $11 
Modern American — of Copper + bié By Dr. E. D. PETE 
Second edition, large 8vo., 342 pp., illustrated. Regular price, $4. 00; 
_with the GEOLOGIST for 189 1, $6.00. 
before collected in accessible form. Large 8vo., pp.420, cloth. Reg- 
ular price, $4.00; with the GEoLoGIsT for 1891, "$6.00. 
Not eti by Col A historical sketch of the dis 
-a of America Las the Norsemen in the tenth century. R. B. 
ERSON, edition ppa e 2mo., cloth. Regular price, 
$1.00 00; with the tae for 1891, 
Geology, Stratigra hical, By JOSEPH 
= iry ae ros In’ Rie’ volumes, with Egma y an 
Vol. I, l Vol. II, Stratigraph 
ical. Regular oie kiy both volumes, in 25. With the GE eh 
for Sear $15 50. [See the advertisement of Macmillan & Co. in the 
Ist. ] 
Bien’s A Atlas of the Metropolitan District and Adjacent Country. 
iwo inches to the mile. Sheets are 23 x 35 inches, the atlas being 
1744 x 23 inches. Regular price, $20. With the brag spe tsi for 1801 
$20. [See advertisement of Julius Bien & Co., ‘J 
For these premiums money must be sent in woe and in 
all cases by postal order or note, or by express or draft on New 
York. 
For public libraries this affords a rare opportunity to procure 
these dard works at reduced prices. We desire to teal foe 
Gxrotoaist to all scientific libraries and laboratories. Our 
scription list is steadily increasing, and with the year 1891, eich 
American session of the International Co of Geologists, © 
= to see it doubled. We hope our old subscribers, 
whom we acknowl our obligation for numerous , will 
call attention to these da for 1891. 
THE AMERICAN Sco oor 
SEPT. 18, 1890, s, MINN 
