it ADVERTISEMENTS. 
Hills, Valleys and Plains of the U. S. 
THE IVES ALTITUDE MAP 
of apit = Hc Map” differing from any elevation map 
previously agy aa seit reaper being ca full $ epee mag to represent the River Systems 
and Mou n Prom whilst ppt A tudes are emphasized by stron ugly con- 
treated Sats The Map i p beautifully gotten e grey in oak erg varnishe 
SIZE 33 X 23 INCHES. PRICE $9.50. 
Aid in the Study of Geology. 
THE IVES STRATA MAP 
rariphioally gen eg peior, apean and outcrop of strata, with the phenomena 
f escarpmen ers, dip, strike, ARa, etc., and the Cards may be bent 
o outlie 
to show pea or yA mee folds. 
novel device by the inventor 
Size, 30 x 24 inches. Price, $17.50. 
JAMES T. B. IVES, F. G. S. 
Is grad inventor of the Method of Construction and the mnt oar paia Bave been deriyed 
m fro ag Bone gay mew —— eh ihtorsiat tion. Diploma 
h of these Maps at the World’s Columbian A pi wan = 
eons OF EMINENT rasa 
. D. Corr, “<i “= University of Pennsylvania, writes; ‘‘ Use the student of 
Sippy aod geology. map indicating elevations i in T is - m important aid to the strati- 
graphic map—both E EPP didaats the structure to t the s 
a resident D. GILMAN, of Johns Hopkins Univ sacs, writes i reference to the Strata Map: 
/ “Wherever Ameri n geology i is taught your me should be nee of the apparat 
Fu tther P SRR E and Testimonials on application 
aog JAMES T. B. IVES, 
Office of the American Naturalist, 
518 Minor Street, Philadelphia, Pa. 
