CONTENTS. vii 



ART. PAGE 



XIV. On Equations of the Fifth Degree ; and especially on a certain 

 System of Expressions connected with those Equations, which 

 Professor Badano has lately proposed. By Sir William Rowan 

 Hamilton, iiy.Z)., P.R.I.A.,F.R.A.S.,' Honorary Member of the 

 Royal Societies of Edinburgh and Dublin ; Honorary or Corres- 

 ponding Member of the Royal or Imperial Academies of St. Peters- 

 burgh, Berlin, and Turin, of the American Society of Arts and 

 Sciences, and of other Scientific Societies at Home and Abroad ; 

 Andrews^ Professor of Astronomy in the University of Dublin, and 

 Royal Astronomer of Ireland. Read August 4, 1 842 329 



XV. On the Compensations of Polarized Light, with the Description 

 of a Polarimeter for measuring Degrees of Polarization. By Sm 

 David Brewster, K.H., D.C.L., F.R.S, M.R.I.A., and V.P.R.S. 

 Edinburgh. Read November 14, 1842 377 



XVI. On the Heat developed during the Formation of the Metallic 

 Compounds of Chlorine, Bromine, and Iodine. By Thomas 

 Andrews, M.D., M.R.I. A., Professor of Chemistry in the Royal 

 Belfast Institution. Read December 12, 1842. . , 393 



■ POLITE LITERATURE. 



I. A Memoir of the Medals and Medallists connected with Ireland. 



By the Very Rev. Henry Richard Dawson, A.M., V. P. R.I. A., 

 Dean of St. Patrick's. Read March 16, 1838, . 1 



II. On the Antiquity of the Kiliee, or Boomerang. By Samuel Fer- 



guson, Esq., M.R.I. A. Read January 22 and February 12, 1838. . 22 



III. On the Egyptian Stele, or Tablet. By the Rev. Edward Hincks, 

 D.D. (Communicated by the President.) Read June 28, 1841. . 49 



IV. On the true Date of the Rosetta Stone, and on the Inferences de- 

 duciblefrom it. By the Rev. Edward Hincks, D.D. Read May 9, 

 1842 72 



V. An Essay upon Mr. Stewart's Explanation of certain Processes of 



the Human Understanding. By the Rev. James Wills, A.M., 

 M.R.I.A. Read February 14, 1842 78 



