149 
was almost unendurable, rising often to 110° F., so that the 
laborers have to be relieved every three or four hours. This 
heat is doubtless caused by the decomposition resulting from 
the air and moisture coming in contact with the exposed ore, 
which is for the most part Pyrites. 
January 9, 1871. 
The President in the chair. Twenty-two persons present. 
Dr. L. FEUCHTWANGER exhibited a specimen of Galena, 
from near Salt Lake, Utah. It is reported to yield one hun- 
dred ounces of Silver to the ton and to contain eighty-five 
per cent. of Lead. He also reported that he had found the 
Speiss or Matt, from the silver ledge on the island opposite 
Thunder Bay in Lake Superior, which he had exhibited at a 
late meeting of the Lyceum, to contain Nickel, Cobalt, Iron, 
Arsenic, Antimony and Sulphur. The quantities of each 
substance have not been, as yet, determined. 
Mr. EMILE GUILLAUDEU sent, for presentation to the 
collection of the Society, a number of fossils taken from 
excavations in the Greensand, at Tinton Falls, Monmouth 
Co., New Jersey. These consisted mostly of the bones of 
Saurians. There were vertebre and teeth of the crocodile, 
and vertebree of perhaps Lelaps or Hadrosaurus, besides others. 
The President, Dr. J. S. NEWBERRY, exhibited a piece of 
Red Sandstone, containing Impressions of Leaves, found in exca- 
vating the foundations for the Gas Office in Williamsburgh, 
This, he said, was a specimen of remarkable interest. In its 
lithological characters this rock closely resembles the Triassic 
Sandstone so much used in New York for architectural 
purposes, but zt contained numbers of very beautifully preserved 
