at ADVERTISEMENTS. 
Hills, Valleys and Plains of the U. S. 
THE IVES ALTITUDE MAP 
novel device by the inventor of the “Strata Map” differing from any elevation map 
previously fgg weet the surface being carefully embos ne oe ee ent the River Systems 
and Mountain Prominences, whilst successive altit titudes Nai by stron ngly co 
ont oslo The Map i is beautifully gotten up, iiid i in oa ak and varnished, 
SIZE 33 X 23 INCHES. PRICE $9.50. 
Aid in the Study of Geology. 
THE IVES STRATA MAP 
graphically exhibits b a sore denudat and outcrop of strata, with the phenomena 
of escarpments, outliers, inliers, dip, strike, iyoreiebile, etc., and the Cards may be bent 
to show syzclinal or ausclaal folds. 
Size, 30 x 24 inches. Price, $17.50. 
JAMES T. B. IVES, F. G. S: 
Is the Inventor of the Method of Construction and the Scientific = ee Fre a Steet 
y him ar my Price yes ge t aiea of Information. Diploma iee 
f these Maps at the World’s Columbian pootitia 
OPINIONS OF EMINENT AUTHORITIES. 
r E. D. Cops, of De University of ina májiape writes: “‘Use o the student o 
topogrey ay sek geology. The map elief is an bona “aid to the strati- 
graphic map—both together ¢ elucidate Ange structure to the eye ia the student,” 
President D. C. Gu of Jo opkins University, writes in reference to the Strata Map: 
“ Wherever American vetoes is Poteet ur map should be part of the apparatus 
er particulars and Iteatteanniais a on n applica cation 
JAMES F: B: IVES, . 
Office of the American Naturalist, 
518 Minor Street. Philadelphia, Pa. 
