154? Cambridge Philosophical Society. 



and that this effect was produced in a slight degree under the red 

 (when exposed a sufficient length of time), strongly under white 

 glass ; and so strong under violet glass, that the effect took place 

 even when the needles were placed in such a position along the 

 magnetic meridian, as would tend to produce, by the earth's in- 

 fluence, a south pole in the exposed extremity. 



Conceiving that the inactive state produced in iron (as observed 

 by Schcenbein) when plunged into nitric acid, sp. gr. 1*36, or by 

 being made the positive pole of a battery, or by any other means, 

 might throw some light upon the nature of the electrical change 

 produced, experiments were instituted to this effect, which showed 

 that no trace of magnetism could be thereby produced. 



March 16. (Stated meeting.) — The following Gentlemen were 

 duly elected Officers and Council for the ensuing year : — 



President : Sir William Rowan Hamilton, LL.D.— Treasurer ; 

 Thomas Herbert Orpen, M.D. — Secretary to the Academy : Rev. 

 Joseph H. Singer, D.D. — Secretary to the Council: James Mac- 

 Cullagh, LL.D. — Secretary of Foreign Correspondence : Rev. 

 Humphrey Lloyd, A.M. — Librarian : Rev. William Hamilton Drum- 

 mond, D.D. — Clerk and Assistant Librarian : Edward Clibborn. 



Committee of Science : — Rev. Franc Sadlier, D.D., Provost of Tri- 

 nity College ; Rev. Humphrey Lloyd, A.M. ; James Apjohn, M.D. ; 

 James MacCullagh, LL.D. ; Rev. William Digby Sadleir, A.M. ; 

 Robert Ball, Esq. ; Robert Kane, M.D. 



Committee of Polite Literature : — His Grace the Archbishop of 

 Dublin ; Rev. Joseph Henderson Singer, D.D. ; Samuel Litton, 

 M.D. ; Rev. William Hamilton Drummond, D.D. ; Rev. Charles 

 Richard Elrington, D.D. ; Rev. Charles William Wall, D.D. ; Rev. 

 Thomas H. Porter, D.D. 



Committee of Antiquities : — Thomas Herbert Orpen, M.D. ; 

 George Petrie, Esq., R.H.A. ; Rev. Caesar Otway; Very Rev. the 

 Dean of St. Patrick's ; Rev. James Henthorn Todd, D.D. ; Henry 

 J. Monck Mason, LL.D. ; Aquilla Smith, M.D. 



The President then appointed the following Vice-Presidents : His 

 Grace the Archbishop of Dublin ; the Provost of Trinity College ; 

 the Rev. Humphrey Lloyd ; the Very Rev. the Dean of St. Pa- 

 trick's. 



CAMBRIDGE PHILOSOPHICAL SOCIETY. 



At the meeting of this society on Monday, June 1, Mr. Hopkins 

 made a communication respecting certain geological phenomena of 

 elevation, and their probable connexion with the existence of vol- 

 canos. When a district is traversed by a number of faults of 

 which the directions are nearly parallel, and the planes of which de- 

 viate (as is generally the case) from vertically, the mass contained 

 between any two adjoining faults will form a perfect or truncated 

 wedge, according as the line in which the planes of the faults, or 

 those planes produced intersect, lies within or without the elevated 

 mass. A double system of wedges will thus be formed, of which 



