vi CONTENTS. 



PAGE. 



On the same. By Sir William R. Hamilton, LL. D 71 



On " Etymological Criticism." By N. L. Benmohel, Esq. ... 75 

 On the early Alchemical and Chemical Physicians. By M. Donovan, 



Esq 81 



On an Ancient Irish Crozier, exhibited for Rev. Dr. Russell. By 



George Petrie, LL. D 82 



A Generalization of Pascal's Theorem. By Sir William R. Hamilton. 100 



Inaugural Address. By the Rev. Thomas R. Robinson, D. D. . . 101 



On Comets. By Edward J. Cooper, Esq 112 



On the Connexion between Certain Terminations of Words in the 

 Hebrew and in different Indo-European Languages. By the 

 Rev. Francis Crawford 112 



On Experiments made in Dublin to determine the Azimuthal Motion 

 of the Plane of Vibration of a freely suspended Pendulum. By 

 the Rev. Samuel Haughton and the Rev. Joseph A. Galbraith. 117, 177 



On the Emission of Light by Anurophonus fimetareous. By Pro- 

 fessor Allman 125 



On the Original Fluidity of the Earth and some other Planets. By 

 the Rev. Samuel Haughton 127 



On two ancient Anaglyphs, preserved in the MS. Room of the Li- 

 brary of Trinity College, Dublin. By the Rev. James Kennedy 

 Bailie, D. D 127, 136 



On an ancient Irish Record preserved in the Chapter-house, West- 

 minster. By the Rev. William Reeves, D. D 132 



On Concert Pitch. By Michael Donovan, Esq 138 



On an Apparatus intended to illustrate the Azimuthal Motion of a 

 freely suspended Pendulum. By the Rev. Robert V. Dixon. . 139 



On a Formula, containing a Symbol which denotes Rotation through 

 a given an^le and round a given axis, by means of Rectangular 

 Co-ordinates and Differential Co-efficients. By the Rev. Charles 

 Graves, D. D 140 



A Letter from the Rev. R. V. Dixon, proposing to establish a Mu- 

 seum in Trinity College, Dublin, for Philosophical Instruments 

 and Apparatus fallen into disuse 142 



On the Experimental Determination of the Limits of the Transit 

 Rate of the Propagation of Waves or Pulses, analogous to those 

 of Earthquakes through solid materials. By Robert Mallet, Esq. 143 



On the Account of Thomas de Chaddisworth, Custodee of the Tem- 

 poralities of the Archbishop of Dublin, from 1221 to 1256. By Sir 

 William Betham 145 



On the Irish MSS. in the Bodleian Library. By the Rev. James 

 HenthornTodd.D.D 162 



On the Nature and Properties of the Aconic Function of Six Vec- 

 tors. By Sir William R. Hamilton, LL. D 177 



On a singular Acoustic Phenomenon by Tuning Forks. By M. Do- 

 novan, Esq 187 



