CONTENTS, IX 



Page 



Piufesisor G. Fobbes on certaiu couuexions between the Molecular Properties 



of Metals 29 



Professor J. Clerk Maxwell on the Final State of a System of Molecules in 



Motion subject to Forces of any kind '. •. 29 



Mr. John NE^^LLE on the Axis of least Moments in a Rectangular Beam . . 32 



Professor Osborne Reynolds on certain Phenomena of Impact 32 



Professor Balfour Stewart on iEthereal Friction 32 



. . ASTHOKOMT. 



Mr. W. R. BiRT on the Importance and Necessity of continued Systematic 



Observations on the Moon s Surface 34 



Dr. William Huggins on the Proper Motions of Nebulse 34 



M. Janssen on the Application of Photography to show the Passage of Venus 



across the Sun's Disk So 



Mr. J. Norman Lockyer on the Results of some recent Solar Investigations 35 



Professor A. Schafarik on the Visibility of the Dark side of the Planet 'S'enus So 



Light. 



Mr. Philip Braham on Light with circularly ruled plates of Glass 36 



Mr. W. S. Davis on some Abnormal Effects of Binocular Vision 30 



Professor J. D. Eatsbett on a Refraction-Spectrum without a Prism 37 



Professor G. Forbes on Irradiation 38 



Dr. Gladstone on Photographs of Fluorescent Substances 38 



Mr. J. Norman Lockyer on the Dresser-Rutherford Diffraction-grating £8 



Professor Clerk Maxwell on the Relation of Geometrical Optics to other 



Branches of Mathematics and Physics 38 



Lord Rayleigh on a Natural Limit to the Shai-pness of the Spectral Lines. . 39 

 Mr. Arthur Schuster on the Influence of Temperature and Pressure on the 



Widening of the Lines in the Spectra of Gases 39 



. on a curious Phenomenon observed on the top of 



Snowdon ■ 40 



Heat. 



Professor G. Forbes on Thermal Conductivity 40 



Professor A. S. Hehschel on the Thermal Conductivities of certain Rocks. . 40 

 Professor Zengeb on the Correlation between Specific Weight and Specific 



Heat of Chemical Elements 40 



Electeicitx xnn Magketism. 



Mr. W. F. Barrett on the Molecular Changes that accompany the Magneti- 

 zation of Iron, Nickel, and Cobalt 40 



on the Relationship of the Magnetic Metals, Iron, Nickel, 



and Cobalt 40 



Professor Ch. V. Zenger on Symmetric Conductors, and the constmction of 

 Lightning-conductors 41 



