at ADVERTISEMENTS. 
Hills, Valleys and Plains of the U. S. 
THE IVES ALTITUDE MAP 
is a novel device by the inventor of the “Strata Map” differing from any elevation map 
atie nid published, the Saige ce Legge: Aee embossed to represent the River Systems 
and Mountain Prominence ilst successive altitudes are emphasized by strongly con- 
ee pemg The Map is is  penntifully gotten up, framed in oak iat varnished, 
SIZE 33 X 23 INCHES. PRICE $9.50. 
Aid in the Study of Geology. 
THE IVES STRATA MAP 
graphically exhibits Sh ay denudat and outcrop of strata, with the phenomena 
of escarpments, outliers, inliers, dip, strike, Trn, etc., and the Cards may be bent 
to show synclinal or anticlinal folds. 
Size, 30 x 24 inches. Price, 
$17.50. 
JAMES T. B. IVES, F. G. S: 
Is T ee of the Method of Construction and the Scientific Data have been derived 
from Government h bc of Fator Diploma and ae Awarded 
"wae of these Maps at the World’s Columbian Expos 
OPINIONS OF EMINENT AUTHORITIES. 
Professor E. D. Corn, of the Univers ity of Pennsylvania, writes: “ Useful to the student o 
topography and geology. ap indicating elevations in relief is an im ortan t aid to the strati- 
graphic map—both together elucidate the structure to the eye o . pie student, 
esident D, C. AN, of Johns Hopkins University, writes in reference to the Strata Map; 
“ Wherever America "poor is taught your map shoul 4 >. © part er “the apparatus,” 
Further particulars 
pplication t 
JAMES T. B. IVES, 
Office of the American Naturalist, 
518 Minor Street, Philadelphia, Pa. 
