CONTENTS. Vll 



On the best relative Position of Three Magnets, in a Magnetical 

 Observatory. By the Rev. Humphrey Lloyd, A.M. . . page 264 



On the Direction and Mode of Propagation of the Electric Force 

 traversing Media, which do not undergo Electrolyzation. By 

 George James Knox, Esq 270, 448 



Letter from M. D'Abbadie to the Rev. Humphrey Lloyd. . . . 272 



On two Gold Torques found at Tara. By George Petrie, Esq. . 274 



Address of the President. . . 276 



On the Analysis of the Water of the Dead Sea. By James Apjohn, 



M.D 287 



On the Purple Dye of Tyre. By William R. Wylde, Esq. . . 293 



On a Sepulchral Urn and Stone Coffin found in the Parish of Kil- 

 bride. By the Rev. Robert Walsh, LL.D 296 



On a Compound of Fluorine and Carbon. By George J. Knox, 

 Esq 299 



On the Property of the Light emitted by Incandescent Coke to 

 blacken Photogenic Paper. By Robert Mallet, Esq 300 



Account for the Year ending the 31st of March, 1839 302 



Description of a Peruvian Mummy. By William R. Wylde, Esq. 305, 312 



On a Manuscript Translation of Part of Virgil's ^Eneid. By 

 Joseph Lentaigne, Esq 309 



On Phosphorescence. By Sir Henry Marsh, Bart 317 



On the original Language of the Phoenicians. By William 



O'Brien, Esq 322 



Account of the Cross of Cong, presented by Professor Mac Cullagh. 326 



On the Action of Air and Water on Iron. By Robert Mallet, Esq. 329 

 Account of the Magnetical Observatory of Dublin. By the Rev. 



Humphrey Lloyd, A.M 330 



On the Insulation of Fluorine, and on a Compound of Fluorine and 

 Selenium. By George J. Knox, Esq 335 



On the Employment of Rockets to determine the Difference of 

 Longitudes of Armagh and Dublin. By the Rev. Thomas R. 

 Robinson, D.D 338 



Researches respecting Vibration, connected with the Theory of 

 Light. By Sir William R. Hamilton, A.M 341 



Address of the President 350 



List of Subscribers for the Purchase of Gold Torques found at Tara 354 



1839— 1840. 



On the Bolina Hibernica. By Robert Patterson, Esq 357 



Notice of a Waterspout observed at Killiney. By the Rev. 



Charles Dickinson, D.D 358 



On a Loligo, found on the Shore of Dublin Bav. By Robert Ball, 



Esq " 362 



On Atmospheric Electricity. By E. S. Clarke, Esq. . . 364, 373 



