vi CONTENTS. 



PAGE. 



On the Application of the Calculus of Quaternions to Problems re- 

 specting the Construction of a Circle touching three given Circles 

 on a Sphere. By Sir William H. Hamilton, LL.D 255 



On the Deflections of the Magnetic Needle, produced by the Con- 

 tact of Metals with each other. By M. Donovan 261,273 



On the same. By the Rev. H. Lloyd, D. D 267 



On the Laws of Propagation of Plane Waves in extended Media. 



By the Rev. Samuel Haughton 267 



On the Proceedings of a Commission issued by Cromwellin 1653 or 



1654. By Sir William Betham 271 



An Account of the Discovery of Ogham Stones presented by Mr. 



Richard Hitchcock -'^ 



An Account of certain Stones presented by Thomas F. Bergin, Esq. 



By George Petrie, LL.D 273 



On the Form of Geodesic Lines through the Umbilic of an Ellip- 

 soid. By A. S. Hart, LL.D 274 



On Feudal Land Tenures in Ireland. By Sir William Betham. . 275 

 On the Theory of Planetary Disturbance. By the Rev. Brice 



Bronwin 2/o 



On the maximum Amount of Resistance required to sustain Banks 



with sloping Tops and Faces. By J. Neville, Esq 275 



On Geodetic Lines in Surfaces of the second Order. By the Rev. 



Charles Graves 283 



On different Applications of a Formula of I\L Liouville. By the 



Rev. William Roberts 288 



On the Atmospheric Wave which passed over Dublin in February, 

 1849. BytheRev.H. Lloyd, D.D., President 291 



On the Manufacture of Sulphuric Acid. By Edmund Davy, Esq. 297 



On the same. By Robert Mallet, Esq 299 



On the Adjustment of the Chordae Vocales by the oblique Arytenoid 



Muscles. By Croker King, M.D 301 



On Theorems relating to Surfaces, obtained by his Method of Qua- 

 ternions. By Sir William R. Hamilton, LL.D 306 



Reportofthe Council, March 16, 1849 309 



On Sugar in the White of Eggs. By John Aldridge, M. D. . . 313 

 On the Preparation of Phosphorus. By M. Donovan, Esq. . . 316 

 On the Effects of Moisture as affecting the Barometric Measure- 

 ment of Heights. By H. L. Renny, Esq 318 



On an Equation of the Ellipsoid. By Sir W. R. Hamilton, LL.D. 324 

 On the Inscription of certain Gauche Polygons in Surfaces of the 



second Degree. By Sir W. R. Hamilton, LL.D 325 



On the Nature of the Fructification of the Rhodospermatous Algae. 



By William H. Harvey, M. D 326 



On the same. By G. J. Allman, M. D 332 



