468 TRANSACTIONS OF THE AMERICAN INSTITUTE. 



tion for three-quarters of an hour. He took twenty-three teeth* 

 from a lady, and she said she felt no pain whatever. There is no 

 stertorous breathing with this mouth-pieee. With this appliance 

 he could keep a person nnder the influence of the gas as long as 

 by any O'ther ana\sthe.sia, bnt it eould not be denied that there are 

 persons wlio,^ if they breathe this gas, it wowld l>e fatal to them— 

 such persons as have ossiiication of the heart should avoid its use. 

 It takes from thirty to sixty seconds to produce anaesthesia. Iii 

 one casx) this afternoon he took fourteen teeth out, and two and a 

 half minutes elapsed before the giis took the proper effect. Dr, 

 White administered nitrous oxide by his improved mouth-piece 

 to some of the audience, but was not as successful in producin;^ 

 insensibility as Dr, Colton at a previous meeting. 



Mr, J. Hirsh said in Germany, on the Khine, many persons die 

 every year from drinking young wine — there is so much carbonic 

 acid in it ; and Prof. Liebig has shown that it h only in the young 

 wine that this excess of the gas is found. 



Dr. J. W. Richards exhibited an apparatus for producing local 

 ana3sthesia, the invention of Dr. Richardson, of London, and read 

 a description of the apparatus from N. Y. Medical Journal for 

 May, 18 66. 



After a discussion of the feasibility of producing local insensi- 

 bility by means of cold, the Association decided to take their sum- 

 mer vacation, and thereupon adjourned to Thursday, Sept. 13th. 



American Institute Polytechnic Association, ^ 

 SeiUeniber 13, 1866. ^ 



Prof. S. D. Tillman in the chair; Mr. T. D. Stetson, Secretary. 

 On resuming the chair the presiding officer said: 

 We assemble under auspicious omens. The war-flags of the 

 great nations of the earth are again furled. Commerce, unmo- 

 lested, seeks foreign seas and enlivens all the channels of inland 

 trafl^c. The workshop resounds with the hum of industry, and 

 the factory vibrates with the labors of the ponderous engine. 

 While activity pervades all departments of business, those who 

 devote themselves to new investi«:ations are not idle. Science 

 continues her researches. Invention and discovery draw, from 

 illimitable sources of novelty, fresh means for the amelioration 

 and material well-being of man. 



