CONTENTS of N° 249.— Fifth Series. 



X. The Pilar Anemometer. By Carl Bartjs, Hazard Professor 



of Physics, Brown University, Providence, TT.S.A page 81 



XI. The Asymmetrical Probability-Curve. By Professor P. Y. 

 Edoeworth, M. A., D.C.L 90 



XII. On the Existence of Vertical Earth- Air Electric Currents 



in the United Kingdom. By Prof. A. W. Rucker, M.A., F.R.S. . . 99 



XIII. A Continuous and Alternating Current Magnetic Curve 

 Tracer. By John Ely Moore, M.E., E.E 106 



XIV. On the Dissociation Degree of some Electrolytes at 0°. 



By R. W. Wood 117 



XV. The Duration of the Plash of Exploding Oxyhydrogen. By 



E. W. Wood 120 



XVI. A very Simple and Accurate Cathetometer. By F. L. O. 

 Wadsworth 123 



XVII. On the Straining of the Earth resulting from Secular 

 Cooling. By Charles Davison, M.A., P.G.S., Mathematical 

 Master at King Edward's High School, Birmingham 133 



XVIII. Notices respecting New Books : — M. Vaschy's Theorie 

 de l'Electricite ; Mr. Resteer's Molecules and the Molecular Theory 

 of Matter ; Messrs. Loudon and McLennan's Laboratory Course 



in Experimental Physics 139-141 



XIX. Proceedings of Learned Societies : — 



Geological Society : — Mr. P. Etjtley on the Alteration of 

 certain Basic Eruptive Bocks from Brent Tor, Devon ; Sir 

 Archibald Geikie on the Tertiary Basalt-plateaux of North- 

 western Europe ; Messrs. A. J. Jukes-Browne and W. Hill 

 on a Delimitation of the Cenomanian, being a Comparison of 

 the Corresponding Beds in Southern England and Western 

 Prance ; G. L. Elles and E. M. B. Wood on the Llandovery 

 and Associated Bocks of Conway ; Mr. A. T. Metcalfe on 

 the Gypsum Deposits of Nottinghamshire and Derbyshire 142-147 



XX. Intelligence and Miscellaneous Articles : — 

 Contributions to the Knowledge of Tropical Bain, by Prof. T. 



Wiesener 148 



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



E. Valenta 149 



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



Valenta ib. 



Interference Experiment with Electrical Waves, by Prof. 



Von Lang 151 



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



On the Double Befraction of Electrical Waves, by Prof. 



Auguste Bighi 152 



Note on Elementary Teaching concerning Pocal Lengths, by 



Prof. Oliver J. Lodge ib. 



*** It is requested that all Communications for this Work may be addressed, 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 



