CONTENTS of N° 237.— Fifth Series. 



XIV. Comparative Review of some Dynamical Theories of 

 Gravitation. By Dr. S. Tolver Preston page 145 



XV. Students' Simple Apparatus for Determining the Mechanical 

 Equivalent of Heat. By Prof. W. E. Ayrtox and H. C. Haycraft 160 



XVI. A Modification of the Ballistic-Galvanometer Method of 

 Determining the Electromagnetic Capacity of a Condenser. By E. 

 Womack 172 



XVII. Electrical Notes. By Arthur Schuster, E.B.S 175 



XVIII. Eonayne's Cubes. By Professor II. Hennessy, E.R.S. 183 



XIX. On the Liquefaction of Gases. By Prof. Dr. Charles 

 Olszewski 188 



XX. Mirrors of Magnetism. By Silt anus P. Thompson. E.B.S. , 

 and Miles Walker 213 



XXI. Notices respecting New Books : — Prof. W. Ostwall's 

 Die wissenschaftlichen Grundlagen der Analytischen Chemie .... 225 



XXII. Intelligence and Miscellaneous Articles : — 



On the Change of Length in Soft Iron "Wire placed in a 

 Uniform Magnetic Field, by B. Rosing 226 



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

 po3t-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Stroet, London. 



