List of Contributors. v 



Joly, J., B.E. PAGE 



On a Method of Determining the Specific Gravity of Small 

 Quantities of Dense or Porous Bodies, .... 41 



Notes on the Minerals of the Dublin and Wicklow Granite. 

 I.— The Beryl and Iolite of Glencullen (Plates II., III., 

 and IV.), 48 



On the Permanency of Frost-marks, and a possible Con- 

 nexion therewith with Oldhamia radiata and 0. antiqua, . 156 



On the Occurrence of Harmotome at Glendalough, Co. 

 Wicklow, 165 



On a Hydrostatic Balance (Plate VII.), .... 347 



On a Peculiarity in the Nature of the Impressions of 

 Oldhamia antiqua and 0. radiata, 445 



The Phenomena of Skating and Professor J. Thomson's 

 Thermodynamic Belation, 453 



Kinahan, G. Henry, M.E.I.A. 



A Table of the Irish Lower Paleozoic Eocks, with their 

 Probable English Equivalents, 34 



On Irish Metal Mining, 200 



On Irish Marbles and Limestones, 372 



On Irish Marbles and Limestones. Supplemental, . . 489 



The Lisbellaw Conglomerate, Co. Fermanagh, and Chesil 

 Bank, Dorsetshire (Plate XII.) , 504 



Arenaceous Bocks of Ireland: — Sands, Sandstones, Grits, 

 Conglomerates, Quartz-rocks, and Quartzytes, . . 507 



Deal Timber in the Lake Basins and Peat Bogs of North- 

 east Donegal, 629 



Gravel Terraces ; Valleys of the Mourne, Strule, and Foyle, 

 Counties of Tyrone and Donegal, 636 



Laves, H. J. Johnston, M.D. 



The Eelationship of the Structure of Eocks to the Conditions 

 of their Formation, 118 



