vi ADVERTISEMENTS. 
Hills, Valleys and Plains of the U. S. 
THE IVES ALTITUDE MAP 
y the inventor of the “Strata Map” differing from any Sa ms 
“racks, xpos ee ecm carefully embossed to represent the River Syste 
tain Pca , whilst successive altitudes are emphasized by strongly ogi 
trasted colors. The Mapi is beautifully gotten up, framed in oak and varn 
SIZE 33 X 23 INCHES. PRICE $9.50. 
Aid in the Study of Geology. 
THE IVES STRATA MAP 
graphically exhibits Superposition, pare on, and outcrop of strata, with the phenom 
of escarpments, outliers, inliers, dip, strike, pE il ts 238 etc., and the Cards may be bent 
ds. 
to show syzclinal or anticlinal fol 
is a novel device 
Size, 30 x 24 inches. Price, $17. 50. 
Is the Inventor of the Method of Construction and thee Siini been derived 
by him f 9 ' Government Sources of Information. z sinens ppt M edal Awa rded 
of these Maps at the World’s Columbia n Exposition 
TOPINIONS OF EMINENT AUTHORITIES. 
Pro r E. D. Core, of the University of Penns sylvania, writes: “ Useful to ce! student of 
topography ae geology. The map indicating elevations in relief is an he nest aid to the strati- 
J AM ES T. B. IVES. 
Office of the American Naturalist, 
518 Minor Street, Philadelphia, Pe 
