V1U CONTENTS. 



PAGE. 



On the ordinary Theorem by which the magnifying Power of a Tele- 

 scope is determined. By the Rev. Thomas Romnev Robinson, 

 D. D ..".... 249 



Address to the Earl of Clarendon, Lord Lieutenant of Ireland,' &c. 253 



On a Method of preserving rusted Iron Antiquities, &c. By Tho- 

 mas F. Bergin, Esq 266 



Address to the Earl of Eglinton, Lord Lieutenant of Ireland, &c. 269 



On the Quantity of Caloric necessary to produce equal Volumes of 

 the Vapours of different Liquids. By James Apjohn, M. D. . . 272 



On a Fragment of an ancient Pentateuch Roll. By the Rev. James 

 H. Todd, D. D 275 



A Letter relating to the discovery in China of Jews. By W. E. D. 

 Broughton, Esq., R. E 281 



On Continued Fractions. By Sir William R. Hamilton, LL.D. 281, 299 



On a Generalization of the Symbolic Statement of Taylor's Theo- 

 rem. By the Rev. Charles Graves, D. D 285 



On the Effects produced by the Vicinity of the Railroad on the Ob- 

 servatory at Armagh. By the Rev. Thomas R. Robinson, D. D. 287 



On an Improvement in the Illuminating of Objects in the Compound 

 Microscope. By Thomas Grubb, Esq. . „ 296 



On the Structure of the Claviform and Sertularian Zoophytes. By 

 Professor Allman 297 



On the Khorsabad Inscriptions. By the Rev. Edward Hincks, D.D. 301 



On the Atomic Weight of Magnesium. By Alexander Mac Don- 

 nell, Esq 303 



On the Chemical Composition and Optical Characters of Penine. 



By James Apjohn, M. D 307 



On the Effects of Lightning in the House No. 19, Herbert-place. 

 By James Apjohn, M. D 309 



On Electro-Magnets. By the Rev. Thomas Romney Robinson, D. D. 310 



On the Illumination of Objects in the Compound Microscope. By 



Thomas F. Bergin, Esq 313 



On Scotch Coins and Counterfeits in Ireland. By Aquilla Smith, 



M.D 324 



On the grounds on which the recommendation was made of Elect- 

 ing Honorary Members. By the Rev. Charles Graves, D. D. . 331 



On the same. By the President 335 



On the Affinities of certain Irish and Latin Words. By the Rev. 

 Charles Graves, D. D 337 



On the Total Curvature of Bounded Portions of Surfaces. By the 

 Rev. Charles Graves, D. D 339 



On Barometric Determinations of Height, made with the view of 

 examining by direct observation the different FormuUe which 

 have been proposed for introducing the Hygrometric condition 

 of the Air into the calculation of Heights! By Rev. Professor 

 Huughton 341 



