832 General Notes. [October, 
widths, from a few inches to a hundred and more feet, and they 
are nearly uninterrupted for a length of 4000 feet along the 
sloping surface of the hill. They are probably outflows from an 
ore body which is bedded with the limestone. Ata depth of 
thirty or forty feet, in some of the shafts, the veins change direc- 
tion so as to be conformable to the limestone, and many of the 
veins have been already shown to be connected below the surface. 
The gangue of the veins is iron oxide and carbonate, with much 
manganese in pyrolusite, psilomelane, etc., which are mixed with 
crystalline limestone, chert, etc. Galena and lead carbonate are 
abundant, and the silver appears as ceratargyrite, embolite and 
sulphuret. These are either visible in amorphous or crystalline 
bodies, or are disseminated in an invisible form, but in large 
quantity, through the gangue substances. The average of the 
assays is high, especially in some of the ores where the silver is 
not recognizable by the eye. The green embolite is easily seen 
in specimens from all parts of this outcrop, and in some larger 
bodies of gangue it colors the entire rock.—Z. D. Cope. 
Published September 22, 1881. 
