CONTENTS of N° 236.— Fourth Series, 



XIX. On the Velocity of the Propagation of Waves in Gaseous 

 Media. By V. Regnault page 1 61 



XX. Researches in British Mineralogy. By David Forbes, 

 F.R.S. &c 171 



XXI. An Experiment in Magneto- Electric Induction. By W. 



R. Grove, F.R.S. &c 184 



XXII. On the Dynamical Theory of Gases. By J. Clerk Maxwell, 

 F.R.SS.L. &B. 185 



XXIII. Addendum to Contributions to the Mineralogy of Nova 

 Scotia. By Professor How 218 



XXIV. On the Integration of the General Linear Partial Differential 

 Equation of the Second Order. By R. Moon, M.A., Honorary Fel- 

 low of Queen's College, Cambridge 219 



XXV. On the Sounds produced by a Jet of Water. By C. 

 Sondhauss 234 



XXVI. Proceedings of Learned Societies : — 



Royal Society: — Mr. W. Huggins on a Hand Spectrum- 

 Telescope , 239 



XXVII. Intelligence and Miscellaneous Articles : — 



On Stellar Spectra, by Father Secchi 24 1 



On Oxychloride of Zinc as a Cement, by Dr. Tollens .' . 242 



Experiments on the Permeability of Cast Iron by the Gases of 



Combustion, by MM. H. Sainte-Claire Deville and Troost . . 243 



On Curves fulfilling the Equation ¥$ + ?t = 0, by W. J. Mac- 



dx ay* 



quorn Rankine, F.R.S. &c 244 



* m * 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. 



