151 



The mine consists of various ores of silver and lead intermixed 

 with zinc, lying in two large and two smaller lodes and veins. These 

 veins underlie to the west, and are cut off by two faults, one to the 

 northward and one to the southward, which, being produced, meet 

 to the westward of the workings. In consequence, as the works 

 deepen, the length of the workings decrease, yet the whole content of 

 the veins has not been found to diminish; the throw of the faults was 

 not yet known, but must be determined when the veins within the 

 area of the faults are worked out. 



Dr. Patterson remarked, that this was the only silver mine 

 worked in the United States, and that the product, as pre- 

 sented at the Mint, had been about ^30,000 in silver, contain- 

 ing about ^7000 in gold. 



Dr. Bache called the attention of the meeting to the late ex- 

 periments of Dr. Faraday upon the condensation of gases. 



Stated Meeting, April 4. 



Present, twenty -two members. 



Dr. Bache, Vice-President, in the Chair. 



A letter was received : — 



From Signor Francesco Zantedeschi, dated Venice, 9th No- 

 vember, 1844, transmitting certain memoirs of which he is the 

 author, and expressing his anxiety that a scientific intercourse 

 should exist between America and Northern Italy, through 

 this Society. 



The following donations were announced: — 



FOR THE LIBRARY. 



The History of Oregon and California, and the other Territories on 

 the North-west Coast of North America; accompanied by a 

 Geographical View and Map of those Countries, and a number 

 of Documents as Proofs and Illustrations of the History. By 

 Robert Greeiihow. Boston, 1844. 8vo. — From the Depart- 

 ment of State, Washington. 



