188 



Easton, Pa., Nov. 12, (81 to 92) ; Dr. Robert Peter, Lexing- 

 ton, Ky., Nov. 9, (81 to 92) ; and the Ohio State Librar3% 

 Columbus, Nov. 13 (Cat. Pt. I). 



Letters of envoy were received from the R. Bavarian 

 Academy, Munich, Sept. 13, Mr. Stan. Meunier, Professor of 

 Comparative Geology in Natural History Museum, at Paris, 

 Oct. 28 ; the Meteorological Office of the Royal Society, in 

 London ; and the Smithsonian Institution. 



Donations for the Library were received from the German 

 Geological Society, the R. Prussian Academy, the Geolog'- 

 cal Association, at Dresden; the Yaudoise Society, at Lau 

 sanne, the Batavian Society Ex. Phil., at Rotterdam, the 

 Revue Politique, M. Stan. Meunier, the R. Astronomical 

 Society, London Nature, Boston Public Library, Academy 

 of Natural Sciences, Franklin Institute, American Journal 

 of Pharmacy, U. S. Coast Survey, Department of the Inte- 

 rior, and Mr. Adolph Schmidt, Jefferson City. 



The volume on Comparative Geology presented by M. 

 Meunier, was on motion, referred to a committee to be ap- 

 pointed at the next meeting. 



The death of Mr. Charles B. Trego, Treasurer of the So 

 ciety, at Philadelphia, Nov. 10, aged 80 years, was announced 

 by the Yice-President, and on motion, Mr. S. W. Roberts 

 was appointed to prepare an obituary notice of the deceased. 



Mr. Brittou exhibited and explained a model illustrating bis method 

 of keeping a laboratory free from the gases evolved vrben metals and 

 minerals are dissolved in acids. 



He dissolves in test tubes supported in position on wire gauze frames. 

 The tops of the tubes are covered with glasses shaped like tubular funnels 

 inverted, the tubular end of which being bent at nearly a right angle are 

 made to pass horizontally into a long wooden chamber four inches wide 

 by six inches de^p. The chamber may be of any length ; it connects at 

 either end or in the centre with a wooden chimney, six by twelve inches 

 in the clear, passing from the laboratory up and above the roof of the 

 building. Heat is applied to the lower end of the tubes by moveable 

 Buusen burners. The gasses are carried away as fast as evolved by the 

 constant current of air which passes throvigh the chamber and up the 

 chimney. 



So completely have the gasses been conducted away, that several very 

 delicate Becker balances have been in use for some years within a few 

 feet of the tubes, without being perceptibly affected. He uses tubes va- 



