Vlll CONTENTS OF VOL. VII. FIFTH SERIES. 



Page 

 M. A. Naquet's Considerations on the two Memoirs of Sir B. 



C. Brodie on the Calculus of Chemical Operations 418 



Prof. Gr. Van der Mensbrugghe on a new Application of the 



Potential Energy of Liquid Surfaces 432 



Dr.E. J. Mills on the Detached Colorimeter, and on Coloriinetry 437 

 Proceedings of the Geological Society : — 



Mr. J. A. Phillips on the History of Mineral Veins .... 441 

 Mr. N. Taylor on the Cudgegong Diamond-field, New 



South Wales 442 



Note on the Magnetic Effect of Electric Convection, by H. A. 



Eowland 442 



On Electric Boundary Layers, by Prof. Helmholtz 443 



A Theoretic and Experimental Demonstration of the definition, 

 " The Temperature of a Body is represented by the Length 

 of the Thermal Oscillation of its Molecules," by R. Pictet . . 445 

 On Ozone and the Electric Effluvium, by M. Berthelot 447 



PLATES. 



L, II., III., IV. Illustrative of Mr. W. Baily's Paper on Starch and 

 Unannealed Glass under the Polariscope. 



V., VI. Illustrative of Professors Perry and Ayrton's Paper on the 

 Music of Colour and Visible Motion. 



VII. Illustrative of Prof. N. S. Maskelyne's Paper on the Crystallo- 

 graphy of Nitrosoterpenes, and M. v. Lang's on a Horizontal 

 Goniometer. 



VIII. Illustrative of Prof. J. Trowbridge's Paper on Methods of 

 Measuring Electric Currents of great Strength, and MM. Kundt 

 and Rontgen's on the Electromagnetic Rotation of the Plane of 

 Polarization of Light in the Vapour of Sulphide of Carbon. 



IX. Illustrative of Prof. A. Steinhauser's Paper on Binaural Audition. 



X. Illustrative of Dr. 0. J. Lodge's Paper on the Determination of 

 the Variation of the Thermal Conductivity of Metals with Tem- 

 perature. 



XI. Illustrative of Professors Ayrton and Perry's Paper on a new 

 Determination of the Ratio of the Electromagnetic to the Elec- 

 trostatic Unit of Electric Quantity. 



XII. Illustrative of Dr. C. W. Siemens's Paper on the Transmission 

 and Distribution of Energy by the Electric Current. 



XIII. Illustrative of Mr. F. D. Brown's Paper on the Maintenance of 

 Constant Pressures and Temperatures. 



ERRATUM IN VOL. VI. 

 Page 457, 13 lines from bottom, for -006 read 60 



ERRATA IN VOL. VII. 



Page 43, line 17 from top, for at read as 



— 43, — 5 from bottom, for Putting =0 read Putting oc=Q 



— 45, — 3 „ for value read values 



— 47, — 2 „ for tan a, read tan 2 u 



