vuli CONTENTS. 
PAGE. 
On the ordinary Theorem by which the magnifying Power of a Tele- 
scope is determined. By the Rey. Thomas Romney Robinson, 
nD areae peer ee . 249 
Address to the Earl of foaic. ees ee of Irelands Ke. 253 
On a Method of PRSSETUIAE rusted Iron -Amanities, &e. By Tho- 
mas F. Bergin, Esq. .« . 266 
Address to the Earl of Beata, ae Tieden of Traine ee. 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. peor. 
Fan cis es Daigeeaie aine | Br cor eee - 275 
A Letter relating to the paieconery in China of Jews. By w. E. ‘D. 
Broughton, Esq.,R.E. . . . 281 
On Continued Fractions. By Sir William R. ‘Haiwilign, LL. D. 281, 299 
On a Generalization of the Symbolic Statement of pace s Theo- 
rem. By the Rev. Charles Graves,D.D. . . wine yp 2S 
On the Effects produced by the Vicinity of the Railroad on the Ob- 
servatory at Armagh. By the Rey. Thomas R. Robinson, D.D. 287 
On an Improvement in the Illuminating of Objects in the ee 
Microscope. By Thomas Grubb, Esq. sites ep Saas . 296 
On the Structure of the Claviform and Sertularian Zoophytes, PY 
Professor Allman... . . 297 
On the Khorsabad iaesianigas By the nex, Balun Hincks, D. D. 301 
On the Atomic weight of sree Hed Alexander Mae Don- 
nell, Esq. . 303 
On the Chemical Gonna me Optica Ciencia of Baines 
By James Apjohn, M.D. . . . . 307 
On the Effects of Lightning in the Heue No. 19, dasthane lace. 
By James Apjohn, M. D. said 309 
On Electro-Magnets. By the Rey. Thanks panues Beniab D. D. 310 
On the Illumination of Objects in the gel ae Micr pages By 
Thomas F. Bergin, Esq. . . . “ 313 
On Scotch Coins and Counterfeits in inc leRee By Aquila Smith, 
MOD A eS ikerh 4 vfike ees ‘ . 324 
On the grounds on witch the faccit hetastion was iets 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 Ww nas By the Rev. 
Charles Graves,D.D. . . . . 337 
On the Total Curvature of Bounded Pins of ap hc By ‘the 
Revs @harlesGravess is D5. sa eters Mate ne. as 339 
On Barometric Determinations of Height, made with the view of 
examining by direct observation the different Formule which 
have been proposed for introducing the Hygrometric condition 
of the Air into the calculation of Heights. bigs Rey. Professor 
ha ie aA RSS SARS is alli . dtl 
