w ADVERTISEMENTS. 
Hills, Valleys and Plains of the U. S. 
THE IVES ALTITUDE MAP 
is a 
previously eeik the aaea being cirefal y erem = represent the River Sra 
. and Mountain Prominences, whilst successive altitudes are emphasized by strongly con- 
trasted colors. The Map is y heentifully gotten up, framed i in oak and varnished. 
SIZE 33 X 23 INCHES. PRICE $9.50. 
Aid in the Study of Geology. 
THE IVES STRATA MAP 
graphically exhibits oe geor ton, and outcrop of strata, with the phenomena 
of escarpments, outliers dip, strike, pecs went etc., and the Cards may be bent 
to show eng or pei itih folds. 
Size, 30 x 24 inches. Price, $17.50. 
JAMES T. B. IVES, F. G. S: 
F “by ‘ht fron om Government bd Lodge and the Scientific Data have been derived 
to each of these Mane at hs Waste tak Diploma and Me Medel Awarded 
Siocon hs OF EMINENT AUTHORITIES, 
of the University of Penns ylvania, writes; “Use o the student of 
4 "the cating p iepa in relief is an important “aid to the strati- 
graphic nap—both together elucidate the structure t nfs a of the student, 
“Whee ay å ba dyson ohns bo ns Unive writes in reference to the Strata Map: 
= ever American geology is taught yo ur map should à be e part of the apparatus, 
urther particulars and Testimonials ¢ on application 
JAMES T. B. IVES. 
Office of the American Naturalist, 
518 Minor Street, Philadelphia, Pa. 
