IV CONTENTS OF VOL. XLI. FIFTH SERIES. 



NUMBEB COXLIX.— EEBEUAEY. 



Page 



Prof. Car] Barus on the Eilar Anemometer 81 



Prof. E. T. Edgeworth on the Asymmetrical Probability- 

 Curve 90 



Prof. A. W. Eiicker on the Existence of Vertical Earth-Air 



Electric Currents in the United Kingdom 99 



Mr. J. E. Moore on a Continuous and Alternating Current 



Magnetic Curve Tracer 106 



Mr. E. W. Wood on the Dissociation Degree of some Elec- 

 trolytes at 0° 117 



Mr. E. W. Wood on the Duration of the Elash of Exploding 



Oxyhydrogen , « 120 



Mr. E. L. O. Wadsworth on a very Simple and Accurate 



Cathetometer 123 



Mr. Charles Davison on the Straining of the Earth resulting 



from Secular Cooling 133 



Notices respecting New Books : — 



M. Vaschy's Thcorie de rElectricite 139 



Mr. Eisteen's Molecules and the Molecular Theory of 



Matter 140 



Messrs. Loudon and McLennan's Laboratory Course in 



Experimental Physics 141 



Proceedings of the Geological Society : — 



Mr. E. Eutley on the Alteration of certain Basic Eruptive 



'Bocks from Brent Tor, Devon 142 



Sir Archibald Geikie on the Tertiary Basalt-plateaux of 



North-western Europe 142 



Messrs. A. J. Jukes-Browne and W. Hill on a Delimita- 

 tion of the Cenomanian, being a Comparison of the 

 Corresponding Beds in Southern England and Western 



Trance 146 



G: L. Elles and E. M. E. Wood on the Llandovery and 



, Associated Eocks of Conway 147 



-. . Mr. A. T. Metcalfe on the Gypsum Deposits of Notting- 

 hamshire and Derbyshire 147 



Contributions to the Knowledge of Tropical Eain, by Prof. 



T. Wiesener 148 



On three different Spectra of Argon, by Dr. J. M. Eder and 



E. Valenta 149 



On the Eed Spectrum of Argon, by Dr. J. M. Eder and E. 



Valenta 149 



Interference Experiment with Electrical Waves, by Prof, von 



Lang 151 



On Electrified Atoms, by Prof. J. J. Thomson 151 



On the Double Eefraction of Electrical Waves, by Prof. 



Auguste Eighi 152 



Note on Elementary Teaching concerning Eocal Lengths, by 

 Prof. Oliver J. Lodge 152 



