13 



Transactions of the Royal Society of Gottingen, from 

 1828 to 1831. Vol. VII. Presented by the Society. 



Proceedings of the American Philosophical Society, to 

 July, 1840. (No. 12.) Presented by the Society. 



Directions for using Philosophical Apparatus. By E. 

 M. Clarke, Esq. Presented by the Author. 



Manuscript Notices relating to the Cathedral of St. 

 Patrick, Armagh. By John Davidson, Esq., M.R.I.A. 

 Presented by the Author. 



Ordnance Survey of the King's County. In 49 Sheets, 

 including Title and Index. Also, 



Ordnance Survey of Carlow. In 28 Sheets, including 

 Title and Index. Presented by His Excellency the Lord 

 Lieutenant. 



November 30, (Stated Meeting.) 

 SIR Wm. R. HAMILTON, LL.D., President, in the Chair. 



Dr. Kane read a Paper " On the Production of Audible 

 Sounds," of which the following is an abstract. 



The sensation of sound is produced upon the ear by the 

 tympanum being thrown into vibratory motion, isochro- 

 nous with the vibrations transmitted from the sounding 

 body. 



Any body which vibrates as a single mass gives origin at 

 the same moment to two waves, whose motions are in opposite 

 directions, and of which one is rarefied and the other con- 

 densed. 



If these two arrive at the tympanum at the same mo- 

 ment and with equal power, perfect neutralization should 

 result, and no sound be heard : hence, where a vibratory 

 body produces upon the ear the sensation of sound, it arises 



