CONTENTS of N° 257 .—Fourth Series. 



XLVII. On the Motions of Camphor on the Surface of Water. By 

 Charles Tomlinson, F.R.S page 409 



XLVIII. Microscopical Investigation of thin polished Laminae of 

 the Knyahynia Meteorite. By Professor A. Kenngott, of Zurich. 

 (With a Plate.) 424 



XLIX. The Parallelogram of Forces. By William Henry Preece, 

 Assoc. Inst. C.E. &c 428 



L. A Determination of the Specific Heat of Air under constant 

 Volume by means of the Metallic Barometer. By F. Kohlrausch . . 430 



LI. On Fulgurites in the Andesite of the Lesser Ararat, and on the 

 Influence of Local Agents on the Production of Thunderstorms. By 

 M. Abich 436 



LII. Hailstorms in Russian Georgia. By M. Abich. (With a 



Plate.) 440 



LIII. On Electrification. By Thomas T. P. Bruce Warren. . . . 441 



LIV. Experimental and Theoretical Researches into the Figures 

 of Equilibrium of a Liquid Mass without Weight. — Eighth Series. 

 By Professor J. Plateau 445 



LV. Note on a Theory of Condensed Ammonia Compounds. By 

 William Odling, M.B., F.R.S 455 



LVI. Notices respecting New Books : — Methods of teaching Arith- 

 metic. By J. G. Fitch, M.A. — The School Arithmetic, and the 

 Science of Arithmetic. ByJ.CoRNWELL, Ph.D., andJ.G. Fitch, M.A. .. 457 



LVII. Proceedings of Learned Societies : — 



Royal Society : — Mr. T. Graham on Hydrogenium 459 



Geological Society : — M. F. Ruschhaupe on the Salt- 

 Mines of St. Domingo ; Messrs. S. Wood and F. W. Harmer 

 on a peculiar instance of Intraglacial Erosion near Norwich ; 

 Mr. E . J. Beor on the Lignite-mines of Poduernuovo, near 

 Volterra; Mr. T. C. Wallbridge on the Geology and Mine- 

 ralogy of Hastings County, Canada West ; Mr. J. W. Flower 

 on the distribution of Flint Implements in the Drift . . .*. 465-468 



LVIII. Intelligence and Miscellaneous Articles : — 



On the Extension of Liquids upon each other, by R. Ludtge. . . . 468 

 Measurement of the Electrical Conductivity of Liquids hitherto 



supposed to be Insulators, by Thomas T. P. Bruce Warren . . 470 

 On the Freezing-point of Water containing Dissolved Gases, and 



on the Regelation of Water, by C. Schultz 471 



On disturbances of Respiration, Circulation, and on the production 



of Heat at great Heights on Mont Blanc, by M. Lortet .... 472 



Index 476 



With Title-page, Contents. &c. 



*** 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. 



