CONTENTS OF VOL. VII. FOURTH SERIES. vii 



NUMBER XLVIIL— SUPPLEMENT TO VOL. VH. 



Page 

 Mr. H. Wilbraham on' the Theory of Chances developed in 



Professor Boole's " Laws of Thought " 465 



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



Leyden Jar {concluded) 476 



M. Becquerel on a new Electro-Magnetic Engine invented by 



M. Marie Davy 489 



Sir W. R. Hamilton on some Extensions of Quaternions .... 492 

 Mr. T. S. Hunt's Description and Analysis of two Mineral 



Species 499 



Dr. Stenhouse on Fraxinine, the crystallizable principle in the 



Bark of the Fraxinus excelsior, or Common Ash 501 



Prof. W. Thomson on the Uniform Motion of Heat in Homoge- 

 neous Solid Bodies, and its connexion with the Mathematical 



Theory of Electricity 502 



Proceedings of the Royal Society 515 



Second Note on the Decomposition of Water by the Pile, by 



M. Jamin 526 



Hansen's Electro-magnetic Engraving Machine 527 



On the Force which governs Chemical Actions, by M. Wittwer. 528 



Note on the Magnetism of Liquids, by M. Quet 529 



Index 531 



