40 TRANSACTIONS OF THE [NOV. 15, 



United States. He also exhibited gold ornaments from the 

 mounds of Orange Co., Florida. The metal was ninety-eight 

 fine, and might have been obtained in North Carolina. One disc 

 had a bullion value of sixty dollars ; another was a casting. Or- 

 naments of silver were also shown. 



Mr. Kunz also referred to the discovery of fine pink spodumene 

 at Andover, Maine; and a fine golden beryl at Litchfield, 

 Conn. 



In reply to questions, Mi-. Kunz said that the Cherokee gold 

 ornaments were of low grade gold, averaging 400 to 600 fine, and 

 many were plated. 



The President said that some of the "plated" ornaments 

 were produced by "pickling" in acids an alloy of gold and 

 baser metals, and then burnishing the surface to leave there a 

 layer of pure gold. 



Dr. Henry A. Mott read a paper on 



A LIMIT TO THE HEIGHT OF THE ATMOSPHERE. 



The subject was discussed by President Newberry and 

 Prof. W. P. Trowbridge. 



November 15, 1886. 

 Stated Meeting. 



The President, Dr. J. S. Newberry, in the chair. 



Fifty-six persons present. 



Mr. Chittenden, referring to the gold ornaments exhibited 

 by Mr. Kunz at the previous meeting, suggested the possibility 

 that the gold might have been obtained from a Spanish ship 

 which was wrecked on the Florida coast in the year 1640, laden 

 with a large amount of gold from Central America. Chroniclers 

 had mentioned that some of the gold was in possession of the 

 natives of the coast. 



Dr. Charles E. Pellew read a paper on 



RECENT investigations ON THE MITIGATION OF PATHOGENIC 



BACTERIA. 



The subject was discussed by Mr. Lucius Pitkin, Prof. C. 

 F. Chandler, Mr. L. E. Chittenden, and the President. 



