726 Chestnut St., Philadelphia, Pa. 
De^ners, Illustrators lag Enfokvers, 
Reproductions of Pen Drawings, Wood-cut or Steel 
Prints, Lithographs, Etc. 
ENGRAVINGS IN RALF-T0NE. 
This work is gradually growing in favor with scientists and geologists. 
For faithful and accurate photographic representation of objects, such as 
meteorites and gems, 
IT HAS NO EQUAL. 
We shall be glad to furnish information, specimens and prices on application. 
Correspondents will oblige us by giving a clear and exact statement of just 
what they wish engraved. 
electrcftint engraving ee. 
726 Chestnut Street, Philadelphia, Pa. 
