CONTENTS. V 



PAOE. 



On the double Mode of Generation of an Ellipsoid. By Sir Wil- 

 liam R. Hamilton, LL.D 173 



On the Ogham Character. By the Rev. Charles Graves. ... 173 



On certain Questions connected with the Reduction of Magnetical 

 and Meteorological Observations. By the Rev. H. Lloyd, D.D., 

 President 180 



On a Silver Brooch, with an Inscription in the Ogham Character. 

 By the Rev. Charles Graves 183 



On an Inscription in the ruined Church of Rathmore, County Meath. 

 By J. Huband Smith, Esq 184 



On some Portions of a Skeleton, an Urn, and Fragment of another, 

 found in the Townland of Kiltalown. By J. Lentaigne, Esq. M. D. 187 



On the Equation of the central Surface of the second Order. By 

 the Rev. Charles Graves 188 



Additional Theorems respecting certain Reciprocal Surfaces. By 

 Sir William R. Hamilton, LL.D 192 



Address of the President, on presenting the Gold Medals to Sir 

 William R. Hamilton, — to the Rev. Samuel Haugbton, — to the 

 Rev. Edward Hincks, D.D., — and John O'Donovan, Esq. . . 193 



On the dynamic Effect of a Turbine, as shown by the Application 

 of Prony's Brake. By the Rev. T. R. Robinson, D. D. ... 210 



On the Corrections required in the Measurement of the Magnetic 

 Declination. By the Rev. H. Lloyd, D.D., President. . . . 219 



On Maps illustrative of the Value of Land in Ireland. By Sir Ro- 

 bert Kane 230, 234 



On the same. By Thomas Oldham, Esq 232 



On the Relation between the Temperature of Metallic Conductors 



and their Resistance to Electric Currents. By the Rev. T. R. 



Robinson, D.D 235 



On Herschel's Nebula, No. 44, as seen in Lord Rosse's Telescope. 

 By the Rev. T. R. Robinson, D. D 236 



On the Contents of an ancient Bronze Vessel found in the King's 

 County. By the Rev. T. R. Robinson, D. D 237 



On the Theory of the Planetary Disturbances. By the Rev. Brice 

 Bronwin 246 



On some general Properties of the Hyperbola. Bythe Rev. Wil- 

 liam Roberts 247 



On a Collection of Antiquities presented by the King of Denmark 

 and the Roval Society of Antiquities at Copenhagen. By the Rev. 

 J. H. Todd, D.D 250 



On the same. By George Petrie, LL.D 251 



On the Inscriptions found on the ancient Pillar Stone at Newton, 



near Pitmachie, in Aberdeenshire. By George Petrie, LL.D. . 253 



On the same. By the Rev. Charles Graves 254 



On Irish Manuscripts in the Possession of the Highland and Agri- 

 cultural Societv of Scotland. Bv the Rev. Charles Graves. . . 255 



