CONTENTS op N° 258.— Fourth Series. 



I. On the Mechanical Properties of Ice. By Henry Moseley, 

 F.R.S., Canon of Bristol. (With a Plate.) page 1 



II. Remarks suggested by Mr. Douglas's Account of a New Opto- 

 meter. By R. Templeton, Esq 9 



III. Note on certain Slates, Felsites, and Elvanites occurring near 

 Knockmahon in the County of Waterford. By J. Arthur Phillips. 12 



IV. Observations of the Corona during the Total Eclipse, August 7, 

 1869. By G. K. Winter, Telegraph Engineer, Madras Railway 

 Company, Arconum 17 



V. A Mathematical Theory of Tides. By the Rev. Professor 

 Challis, M.A., F.R.S., F.R.A.S 18 



VI. On the Motions of certain Liquids on the Surface of Water. By 

 Charles Tomlinson, F.R.S 32 



VII. Note on some Propositions in the Theory of the Tides. By 

 the Rev. T. K. Abbott, M.A., Fellow and Tutor of Trinity College, 

 Dublin 49 



VIII. On Secondary Currents and a new Secondary Battery. By 

 John Parnell, M.A., F.R.A.S. 52 



IX. Reply to some Remarks of Father Secchi on the recent Solar 

 Discoveries. By J. Norman Lockyer, F.R.S 61 



X. Proceedings of Learned Societies : — 



Royal Society : — Mr. H. C. Sorby on Jargonium, a new Ele- 

 mentary Substance associated with Zirconium ; Mr. J. Park 

 Harrison on Solar Radiation . , 65-73 



XI. Intelligence and Miscellaneous Articles : — 



On the Laws of Induction. By MM. Jamin and Roger ...... 73 



On the Calorific Power of the Lunar Rays. By M. H, Marie-Davy 78 



*„* 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. 



