CONTENTS. 



SCIENCE. 



ART. PAGE 



I. Researches on the Nature and Constitution of the Compounds of Am- 



monia. By Robert Kane, M.D., M.R.I.A., Superintendant of the 

 Laboratory, and Professor of Chemistry to the Apothecaries' Hall 

 of Ireland, Professor of Natural Philosophy to the Royal Dublin 

 Society. Read April 9, May 14 and 28, 1838 1 



II. Description of the Cydippe Pomiformis Mihi (Beroe ovatus Flem.), 



with Notice of an apparently undescribed Species of Bolina, also 

 found on the Coast of Ireland. By Robert Patterson, Esq., 

 Member of the Natural History Society of Belfast. Read Decem- 

 ber 10, 1838 91 



III. On the Longitude of the Armagh Observatory, given by fifteen 

 Chronometers of Arnold and Dent. By the Rev. Thomas Romney 

 'RoBm^o^,D.D.,M.R.I.A.,^c. Read December 10, 1838. . . .110 



IV. On the Difference of Longitude between the Observatories of Ar- 

 magh and Dublin, determined by Rocket Signals. By the Rev. 

 Thomas Romney Robinson, D.D., M.R.I. A., 8^c. Read June 24, 

 1839 121 



V. On the Direction and Mode of Propagation of the Electric Force 



traversing interposed Media. By George J. Knox, Esq., A.M., 

 M.R I.A. Read February 11, 1839 147 



VI. On the Bolina Hibernica. By Robert Patterson, Esq., Member 

 of the Natural History Society of Belfast. Read November 11, 

 1839 154 



