CONTENTS OF VOL. II. SIXTH SERIES. Vll 



P?vge 

 Mr. J. H. Jeans on the Theoretical Evaluation of the Ratio 



of the Specific Heats of a Gas 638 



M. E. H. Amagat on the Isotherinals of Fluids, and in 



particular of Hydrogen 651 



Mr. R. Beattie on the Length of the Break-Spark in an 



Inductive Circuit 653 



Notices respecting New Books : — 



L. Barbillion's Production et emploie des Conrants 



alternatifs 659 



Proceedings of the Geological Society : — 



Mr. Beeby Thompson on the Use of a Geological Datum. 659 

 Messrs. J. R. Kilroe and A. McH.enry on Intrusive, 

 Tuff-like, Igneous Rocks and Breccias in Ireland .... 660 



Index 661 



