CONTENTS. 



VOLUME III. 



1845-1847. 



PAGE. 



Theory of Quaternions. By Sir W. R. Hamilton. . . . 1,109,273 

 Returns laid on the Table by order of Council 17 



Letter read from Rev. T. R. Robinson, D. D., on the Periodical 

 Meteors of lOth August 18 



An Account of two remarkable Halos and Paraselenae observed in 

 May and June last. By Rev. H. Lloyd, D. D 18 



On an ancient wooden Table and Dish, dug up in Peat or Turf Bog. 

 By Rev. Thomas Porter, D. D 21 



On the original Use of certain Golden Ornaments and other Arti- 

 cles in the Museum of the Royal Irish Academy. By Robert 

 Ball, Esq 25 



On Diverging Infinite Series, and on certain Errors connected there- 

 with. By Professor Young, of Belfast 27 



On the Subject of Total Reflexion. By Professor Mac Cullagh. . 49 

 On Algebraic Triplets. By Rev. Charles Graves, A.M. 51, 57, 80, 105 

 On " Dugald Stewart's Explanation of certain Processes in the 

 Human Understanding." By the Rev. James Wills 65 



On two undescribed Algae. By Dr. Allman 67 



On Lord Rosse's Telescope. By the Rev. T. R. Robinson. , 68,114 

 A Letter read from Charles Bourns, Esq., giving an Account of the 

 Excavation made in the Round Tower of Lusk 68 



On the Construction and Results obtained with the Six-foot Re- 

 flecting Telescope of the Earl of Rosse. (See p. 114). ... 74 



On the present State of the Ancient Ecclesiastical Remains of lona. 



By J. Huband Smith, Esq 76 



On some Geometrical Theorems relative to Elliptic Functions. By 



Wm. Roberts, Esq., F. T. C. D 77 



On the maximum Amount of Resistance required to sustain Banks of 



Earth. By John Neville, Esq 84 



On a new Photographic Process, which he calls the Catalysotype. 



By Dr. Thomas Woods 89 



