vi CONTENTS OF VOL. VII. — FOURTH SERIES. 



Page 

 Dr. Herapath's Additional Directions and Improvements in the 



Process for the Manufacture of Artificial Tourmalines 352 



Sir David Brewster's Notice on Barometrical, Thermometrical, 



and Hygrometrlcal Clocks 358 



Proceedings of the Royal Society 358 



■ Royal Institution , 372 



On a new Meteorite from New Mexico, by Dr. F. A. Genth. . 378 



On M. Foucault's Pendulum Experiments 379 



On the supposed Conversion of Ammonia into Nitric Acid in the 



Animal Organism, by Christian JafFe 381 



Meteorological Observations for March 1854 383 



Table 384 



NUMBER XLVII.— JUNE. 



Dr. E. W. Davy on a new and simple Method of determining 



the amount of Urea in the Urinary Secretion 385 



The Rev. S. Haughton's Account of Experiments to determine 



the Velocities of the Rifle Bullets commonly used 390 



Prof. Faraday on Subterraneous Electro-telegraph Wires .... 396 

 The Rev. B. Powell on some Experiments on Rotatory Motion. 398 

 Prof. Collins on the Attraction of Ellipsoids considered geome- 

 trically 401 



Mr. A. Cayley on the Theory of Groups, as depending on the 



Symbolic Equation 0" = 1 .— Part II 408 



Dr. Roxburgh on the Cartesian Barometer 410 



M. R. Kohlrausch's Theory of the Electric Residue in the 



Leyden Jar (continued). (With a Plate.) 412 



Prof. Connell on the Voltaic Decomposition of Water 426 



M. P. Riess on the Generation of Heat by Electricity 428 



Prof. Challis on certain questions relating to the Moon's Orbit. 429 



Mr. J. J. Sylvester's Note on a Formula by aid of which and 



of a table of single entry the continued product of any set of 



numbers (or at least a given constant multiple thereof) may 



be eflTected by additions and subtractions only without the 



use of Logarithms 430 



Proceedings of the Royal Society 437 



Cambridge Philosophical Society 442 



On the Production of Ozone by the Decomposition of Water 



at Low Temperatures, by M. Goret 459 



On the Separation of Nickel from Cobalt, by Prof. Liebig 461 



On the Preparation of Hydroferrocyanic Acid, by Prof. Liebig. . 461 

 Observations on the Nomenclature of the Metals contained in 



Columbite and Tantalite, by Prof. A. Connell 461 



Meteorological Observations for April 1854 463 



Table 464 



