﻿XXXIII. On Cometary Theory. By John Tyndall,F.R.S.&c.^6?241 



XXXIV. Remarks on the Luminous, Thermal, and Acoustic Phe- 

 nomena attending the Fall of Meteorites. By Chevalier W. von 

 Haidinger 246 



XXXV. Contributions to the Mineralogy of Nova Scotia. By 

 Professor How, D.C.L., University of King's College, Windsor, N.S. 264 



XXXVI. On the Galvanic Resistance of Liquids. By Dr. Paalzow. 27 1 



XXXVII. Fundamental Principles of Molecular Physics. By Pro- 

 fessor J. Bayma, S. J., of Stonyhurst College 275 



XXXVIII. Further Remarks on the Explanation of Stewart and 

 Tait's Experiments on the Heating of a Disk rotating in vacuo. By 

 Oscar Emil Meyer 287 



XXXIX. On the Falsetto or Head-sounds of the Human Voice. 

 By William Marcet, M.D., F.R.S., Assistant Physician to the 

 Hospital for Consumption and Diseases of the Chest, Brompton .... 289 



XL. On the Absorption of Light by the Air. By H. Wild 293 



XLI. Notices respecting New Books : — An Introduction to Scien- 

 tific Chemistry ; designed for the use of Schools and Candidates for 

 University Matriculation Examinations. By F. S. Barff, M.A 304 



XLII. Proceedings of Learned Societies : — 



Royal Society: — The Rev. S. Haughton's Notes of a Compa- 

 rison of the Granites of Cornwall and Devonshire with those 

 of Leinster and Mourne 306 



Geological Society : — Sir R. I. Murchison on the Geological 

 Structure of North-western Siberia; Prof. Sandberger on a 

 Section of a Well at Kissingen ; Mr. A. Tylor on the Forma- 

 tion of Deltas % k . .. .. 309-311 



XLIII. Intelligence and Miscellaneous Articles : — 



On the Coloration of Peroxide of Nitrogen, by M. Salet 312 



On the Magnetism of Chemical Compounds, by Professor Wiede- 

 mann 314 



On the Latent Heat of Volatilization of Sal-ammoniac, by M. C. 

 Marignac 318 



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* 



