av ADVERTISEMENTS. 
The Ives Strata « Altitude Maps 
OF THE UNITED STATES AND PART OF CANADA. 
B. Ives, F. G. S., Member of the 
By James T. 
pessi Institute of Mining Engineers, the American 
Association for the Advancement of Science, 
and the Canadian Institute. 
THE STRATA MAP 
consists of a series of seven Superimposed Maps, rep- 
resenting the seven Geologica Systems of the coun- 
try, colored as recommended bg ‘the International bee 
pene of Sones sts, pi rtions 
with the several syste: in nature. 
It laa exhibits superposition, denud- 
ation, and outcrop of strata, with the phenom- 
enaof escarpments, outliers, inliers, dip, strike, 
conformability, etc., and the Cards may be bent 
agrecani' bly 
to show synclinal or anticlinal folds. 
THE ALTITUDE MAP 
novel device by the inventor 
culy arana hn surface 
Mountain Prominences, whilst s 
o is beau utifally Sane i framed in oak and varnished, 
n the table. 
The 
aii or stand erect o 
ta Map” differing from any elevation map oe 
t the River System a 
Price, 
he two ed are ee in a neat cloth-covered case, gilt lettered. 
Siz 4.00. 
1x15 inches. 
BINDER & KELLY, Publishers, 
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96 PAGES TEXT MONTHLY; 
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