CONTENTS 



SCIENCE 



ART. PAGE. 



I. On Galvanometric Deflectmts producible by Attrition and Contact of 

 Metals under certain circumstances. By Michael Donovan, Esq., 

 M.R.I.A. Read January 8, 22, and February 12, 1849. ... 1 

 II. Discussion of Tidal Observations made by direction of the Royal Irish 

 Academy in 1850—1851. By the Rev. Samuel Haughton, M.A., 

 M.R.I.A ., 4'C , Fellow of Trinity College, and Professor of Geology in 



the University of Dublin. Eead April 24, 1854 35 



III. On the Physical Conditions involved in the Construction of Artillery, and 

 on some hitherto unexplained Causes of the Destruction of Cannon in 

 Service. By Robert Mallet, Esq., Mem. Ins. Civ. Eng., M.R.I.A., 

 F.R.S., ^c. Read June 25, 1855 141 



vol. xxin. 



