IV CONTENTS. 



PAGE. 



On the total Intensity of the Earth's Magnetic Force in absolute 

 Measure applicable to the high Magnetic Latitudes. By the Rev. 

 H. Lloyd, D. D„ President 57 



On a singular Implement discovered in an ancient Copper Mine in 

 the County Cork. By Professor Allman C4 



Letter relating to Wood's Coinage. By Dr. William King, Arch- 

 bishop of Dublin. Read by the Rev. J. H. Todd, D. D. , . . 66 



On a General Method of deciphering Secret Alphabetic Writings, 

 as applicable to the Irish Ogham. By the Rev. C. Graves, A. M. 70 



Letter from Thomas L. Cooke, Esq., to Sir William Betham, on 

 Etruscan Coins in his Possession 74 



On the Application of Quaternions to the Determination of the Dis- 

 tance of any recently discovered Comet or Planet from the Earth. 

 By Sir William R. Hamilton 75 



On a Table Gas Lamp. By M. Donovan, Esq 75, 91 



On the Theory of Linear Differential Equations. By the Rev, 

 Charles Graves, A. M 88 



Report of the Council, March 16, 1848 92 



On Tar, as a Preservative against the Potato Disease. By His 

 Grace the Archbishop of Dublin 119 



On the present Condition of the Earl of Rosse's great Telescope. 

 By the Rev. T. R. Robinson, D. D 119 



On the different Conditions necessary to insure a Steam Engine's 

 working at full Pressure. By the Rev. R. V. Dixon 128 



On the Larynx, Trachea, and CEsophagus of the Elephant. By Pro- 

 fessor Harrison 132 



On the comparative Advantages of smelting Lead Ore by the Blast- 

 hearth and the Reverberatory Furnace. By M. Donovan, Esq. 136 



On Mathematical Expressions for Hypothetical and Disjunctive 

 Propositions. By the Rev. Charles Graves 147 



On ancient Graves found at Killucan. By Robert R. Cornwall, 

 Esq 149 



On a compound Rainbow. By Stewart Blacker, Esq 149 



On a remarkable Aurora. By James Pim, Esq 151 



On the Construction of a new Form of the Galvanic Battery. By 



the Rev. Professor Callan, D.D 152 



On the Anatomy of the " Lachrymal Apparatus" in the Elephant. 

 By Professor Harrison 158 



An Account of certain Antiquities presented to the Academy. By 

 Maurice O'Connell, Esq 166 



On the new Planet Metis. By A. Graham, Esq 167 



On the same. By Sir William R. Hamilton 169 



On Improvements in the Construction of the Galvanometer. By 

 M. Donovan, Esq 169 



On the same. By the Rev. H. Lloyd, D. D., President 171 



