List of Contributors. vii 



Sollas, W. J., LL.D., F.R.S. page 



A Contribution to the History of Flints, .... 1 



Preliminary Observations on the Granites of Wicklow and 

 Down, 257 



Preliminary Account of the Soda-Granites and Associated 

 Dykes of Co. Wicklow, 263 



On the Geodine Genera Synops, Vosm., and Sidonops. A 

 Correction, 276 



Stoney, G. Johnstone, D.Sc, F.R.S. 



Tables for the Easy Conversion of British into Metrical 

 Measures, 355 



Formulae for the Easy Determination of Gaseous Volumes 

 and Weights. 387 



On Texture in Media, and on the Non-existence of Density 

 in the Elemental Ether, 392 



Studies in Ontology, from the Standpoint of the Scientific 

 Student of Nature. I. — The First Step in which an 

 attempt is made to find out in what way the Scientific 

 Study of Nature is related to the actual Existences and 

 Events of the Universe, 475 



Trouton, Frederick T., B.E. 



On the Motion of a Body near Points of Unstable Equi- 

 librium, and on the same when capable of Internal 

 Vibration, ......... 39 



On a Convenient Method of obtaining any required Electrical 

 Potential for use in Laboratory Teaching, . . .110 



On the Control Supply-pipes have on Reeds, . . . 132 



