CONTENTS OF VOL. XXXVI 



(FIFTH SEEIES). 



NUMBER CCXVIIL— JULY 1893. 



Page 



Prof. Oliver Lodge on the Foundations of Dynamics 1 



Prof. Ludwig Boltzmann on the Methods of Theoretical 



Physics 37 



Messrs. W. H. Harvey and F. Hird on Brush Discharges in 



G-ases 45 



Prof. H. A. Eowland : New Table of Standard Wave-lengths . 49 

 Mr. C. Y. Boys on the Drawing of Curves by their Curvature. 



(Plate I.) 75 



Mr. A. P. Trotter on a new Photometer 82 



Mr. M. Carey Lea on the Nature of certain Solutions, and on 



a New Means of Investigating them 88 



Prof. F. Y. Edgeworth : Exercises in the Calculation of Errors. 98 

 Mr. Spencer U. Pickering on the Hydrates of Hydrogen 



Bromide Ill 



Dr. Silvanus P. Thompson : Some Notes on Photometry .... 120 



Lord Eayleigh on the Theory of Stellar Scintillation 129 



Notices respecting New Books : — 



A Memorial of Joseph Henry 142 



Dr. A. Macfarlane's Fundamental Theorems of Analysis 



Generalized for Space, and The Imaginary of Algebra. 143 

 Prof. Otto Koll's Theorie der Beobachtungsfehler und die 

 Methode der Kleinsten Quadrate, mit ihrer Anwendung 



auf die Geodiisie und die Wassermessungen 144 



Proceedings of the Geological Society : — 



Mr. George Barrow on an Intrusion of Muscovite-biotite 

 gneiss in the South-eastern Highlands, and its accom- 

 panying Thermo-metamorphism 145 



Mr. Frank Eutley on the Dwindling and Disappearance 



of Limestones 146 



Dr. Charles Callaway on the Origin of the Crystalline 



Schists of the Malvern Hills 146 



Messrs. Harker and Marr's Supplementary Notes on the 



Metamorphic Rocks around the Shap Granite 147 



Prof. J. F. Blake on the Felsites and Conglomerates 

 between Bethesda and Llanllyfni, North Wales 148 



