IV CONTENTS OF VOL. VII. FIFTH SERIES. 



Page 

 On an Automatic Current-Regulator, by M. Hospitalier .... 71 

 On the Physical State of Central Europe in the Tertiary 



Period, by M. van Tiegheni 72 



On the Diffusion of Liquids, by J. Stefan 74 



On the Specific Heats and Heat of Fusion of Gallium, by M. 



Berthelot 75 



NUMBER XLL— FEBRUARY. 



M. E. Wiedemann's Investigations on the Nature of Spectra 77 

 Dr. A. Schuster on an easy Method for Adjusting the Colli- 

 mator of a Spectroscope 95 



Prof. A. M. Mayer on the Morphological Laws of the Confi- 

 gurations formed by Magnets floating vertically and sub- 

 jected to the Attraction of a superposed Magnet ; with 

 Notes on some of the Phenomena in Molecular Structure 

 which these experiments may serve to explain and illustrate 98 

 Mr. C. Y. Boys on a Condenser of Variable Capacity, and a 



Total-Reflexion Experiment 108 



Mr. J. Brown on the Theory of Voltaic Action 109 



Mr. W. "W. Jacques on the Effect of the Motion of the Air 

 within an Auditorium upon its Acoustic Qualities. ........ Ill 



Professors J. Perry and W. E. Ayrton on the Music of Colour 



and Visible Motion. (Plates V. and VI.) 117 



Mr. T. Bayley on Catalysis, and the Nomenclature of Oxides . . 126 

 Mr. N. S. Maskelyne on the Crystallography of the Nitroso- 



terpenes of Dr.'Tilden. (Plate VII. figs. 1-6.) 129 



Mr. N. S. Maskelyne on an artificial Diopside Rock formed in 



a Bessemer Converter by Mr. Percy Gilchrist 133 



Mr. N. S. Maskelyne on Enstatite Rock from South Africa . . 135 

 M. V. von Laug on a Horizontal Goniometer. (Plate VII. 



figs. 7 & 8.) 136 



Messrs. J. A. Wanklyn and W. J. Cooper on the Moist-Com- 

 bustion Process ; some Reactions of Alkaline Permanganate 



of Potash 138 



Notices respecting New Books : — 



Mr G. B. Prescott on the Speaking Telephone, Talking 



Phonograph, and other Novelties 140 



Proceedings of the Geological Society : — 



Mr. P. Doyle on some Tin-deposits of the Malayan Pe- 

 ninsula 142 



Mr. J. C. Hawkshaw on the Consolidated Beach at Per- 



nambuco 143 



Note on Electromagnets in Telegraphy, by Oliver Heaviside . . 143 



On two new Fluorescent Substances, by E. Lommel 144 



On Thermal Radiation at High Temperatures, by J. L. Soret . . 145 

 On Electrochemical Actions under Pressure, by A. Bouvet . . 148 



