Hills, Valleys and Plain s of the U. S. 



THE IVES ALTITUDE MAP 



is a novel device by the inventor of the <: Strain M q <li i . t i 

 previously published, the surface being carefully embossed to repi 



li tudes are emphasized by strongly con- 

 trasted colors. The Map is beautifully gotten up, framed in oak and varnished. 



Aid in the Study of Geology. 



THE IVES STRATA MAP 



cally exhibits Sttf nd outcrop of strata, with the pht 



xrpments, outliers, in ■■ and the Cards may 









r^t-l " n*-^**-**^* Mf' 





JAMES T. B. IVES, F. G. S. 



OPINIONS OF EMINENT AUTHORITIES. 



W F^er^rVi: .."ruljfi^ion" : *"* ^ ^ aPParatU8 -" 



JAMES T. B. IVES, 



Office of the American Naturalist, 



518 Minor Street, Philadelphia, Pa. 



