PROCEEDINGS 
OF THE 
LYCEUM OF NATURAL HISTORY 
IN THE 
CITY OF NEW YORK. 
Se 
SECOND SERIES, 
March 10th, 1878. Chemical Section. 
President Newberry in the chair. Forty persons present. 
Dr. FEUCHTWANGER exhibited specimens of metallic silver- 
leaf, formed, by electro-chemical action, from a solution of 
sulphate of copper and silver. The liquid was allowed to 
stand at rest for twenty-four hours, in a large tank lined with 
lead, and in which some metallic copper had also been placed. 
The silver, becoming detached, was then found floating on the 
top of the solution, as a lace-like sheet of aggregated crystal- 
line scales, so thin as to be translucent, and of very elegant 
aspect. The upper surface of the film, exposed to the air, 
has a brilliant metallic luster; while the lower surface, rest- 
ing on the liquid, is dark. 
He suggested the inquiry whether any such action could 
explain the peculiar association of metallic silver with copper, 
in the Lake Superior region. 
I—l1. 
