299 



acid. The residue, after the sublimation of the Tellurium, melts, 

 and is reduced upon charcoal to metallic globules. Cupelled, a 

 minute globule of gold remains. By qualitative analysis on 

 1.5 grammes I obtained Sulphur, Bismuth, Tellurium, and traces 

 of Selenium. I also found metallic gold mechanically mixed 

 %vith the folia of Tellurium ore, and in very fine scales. Oxide 

 of Iron and Silica were also obtained, which were mechanical 

 mixtures. By a carefully conducted analysis of one gramme 

 of the picked scales of Tellurium ore, I obtained the following 

 results : — 



1.0020 



Which will give approximately the formula Bi Te^-j-Bi S. 



The mineral, therefore, agrees closely with the Tetradymite 

 of Schemnitz, Hungary, analyzed by Berzelius. It is a very 

 rare mineral, never before discovered in the United States. 



Dr. C. T. Jackson stated, that he had observed that Cochituate 

 water dissolves lead and tin. In numerous specimens drawn 

 from pipes in the city, he had always detected these minerals, 

 the tin being supplied from the solder at the joints. He said he 

 knew no way by which the community could be protected from 

 the lead in the mains, large quantities of it sometimes getting 

 into them at the joints, where it is used as packing. 



Dr. Burnett presented an Actinoid Polyp attached to a 

 bivalve shell, which had been drawn up from deep water in 

 Boston harbor. Between the valves of the shell was found 

 a Butter-fish, which was also presented to the Society. 



The Curator of Ornithology announced the donation of 

 a specimen of Colymhus glacialis, Great Northern Diver, 

 from Mr. G. Rowland Shaw ; Podiceps auriius, Eared 

 Grebe, female, from Mr. J. L. Tucker; Ibis guarana^ 

 Glossy Ibis, from the Harvard Natural History Society. A 



