CONTENTS OF VOL. XII. — FOURTH SERIES. V 



NUMBER LXXIX.-OCTOBER. 



Page 

 Prof. Clausius on the Application of the Mechanical Theory of 



Heat to the Steam-engine 241 



Prof. Powell on the Demonstration of Fresnel's Formulas for 



Reflected and Refracted Light.— Part III 266 



Dr. Schunck on Rubian and its Products of Decomposition. — 



Part III. {concluded) 270 



Mr. J. P. Hennessy's Note on Professor Stevelly's Paper on the 



Theory of Parallels 283 



M. T. Plateau on the recent Theories of the Constitution of 



Jets of Liquid issuing from Circular Orifices 286 



Dr. Atkinson's Chemical Notices from Foreign Journals .... 297 



Proceedings of the Royal Society 305 



Cambridge Philosophical Society 316 



On the Heat absorbed in Chemical Decompositions, byJ. P. Joule. 321 



On a Law of Electrical Heat, by Dr. P. Riess 322 



Observations on Ozone, relating to a recent paper of M. Cloez, 



by M. Bineau 324 



Note on the Endosmose of Gases, by J. Jamin 325 



Meteorological Observations for August 1856 327 



Table 328 



NUMBER LXXX.— NOVEMBER. 



Prof. Challis on a Theory of the Composition of Colours on the 



Hypothesis of Undulations 329 



Prof. Clausius on the Application of the Mechanical Theory of 



Heat to the Steam-engine {continued) 338 



Mr. A. Cayley's Second Note on the Theory of Logarithms . . 354 

 Dr. Debus on the Action of Nitric Acid on Alcohol at Common 



Temperatures 361 



Mr. J. P. Hennessy on a Solution of the Theory of Parallels, 

 from the Definitions of Euclid, without deviating from the 



ordinary Principles of Geometrical Proof 371 



Prof. Stevelly on the Doctrine of Parallel Lines 375 



Mr. J.N. Hearder on a powerful Form of the Induction Coil, 

 with some new Statical and Thermal EflPects of the Induced 



Current 377 



Mr. J. P. Joule on Prof. Clausius's Application of the Mecha- 

 nical Theory of Heat to the Steam-engine 385 



Dr. Heddle on the " Davidsonite " of Thomson 386 



Proceedings of the Royal Society 387 



Cambridge Philosophical Society 397 



Note on the Employment of Induction Apparatus. — The Mer- 

 curial Interruptor. By Leon Foucault 403 



Note on Colonel Sabine's Periodic and Non-periodic 'J'empera- 

 ture Variations at Toronto, by S. M. Drach, Esq., F.R.A.S. 406 



