w ADVERTISEMENTS. 
Hills, Valleys and Plains of the U. S. 
THE IVES ALTITUDE MAP 
a novel device by the inventor of the “Strata Map” differing from any elevation map 
cnir miie published, the surface being carefu sa ts Seine ed to represent the River Systems 
i mine il 
and Mountain Prominences, whilst successive a es are emphasized by strongly con- 
trasted colors. The Map is ‘beautifully gotten os gady in oak and varnished. 
SIZE 33 X 23 INCHES. PRICE $9.50. 
Aid in the Study of Geology. 
THE IVES STRATA MAP 
graphically e Superposition; denudation, and outerop of strata, with the phenomena 
of escarpments, outliers, inliers, dip, strike, gi mr etc., and the Cards may be bent 
to show aces! or anticlinal folds. 
Size, 30 x 24 mene Price, $17.50. 
Is ~ Sage ae of the Method of aun wires and he entific Da ts have been derived 
y him m Gevernatent Sources of information. Diploma and Modni Awarded 
h of these Maps at the World’s Columbian Expos 
“OPINIONS OF EMINENT AUTHORITIES. 
E, of the University of Pennsylvania, writes: “Useful to the student of 
e map indicating elevations in relief is an im portant a id to the strati- 
ent, 
x niversity, writes in reference to the Strata Map: 
bebe mat America n geology is taught your map at ne nen of the apparatus 
er particulars and Testimonials on application 
JAMES T. B. IVES, 
Office of the American Naturalist, 
518 Minor Street, Philadelphia, Pa. 
