CONTENTS OF VOL. VII. 



(FOURTH SERIES.) 



NUMBER XLII.— JANUARY 1854. 



Page 



Mr. W. J. M. Rankine on the Mechanical Action of Heat . . 1 

 Dr. Stenhouse on the dried Coffee-leaf of Sumatra, which is 

 employed in that and some of the adjacent Islands as a sub- 

 stitute for Tea or for the Coffee-bean 21 



Dr. Stenhouse's Examination of the Crystalline Deposit which 



forms in Oil of Bitter Almonds 26 



Dr. Stenhouse on Xanthoxyline, a new Crystalline principle 

 from Japanese Pepper, the fruit of the Xanthoxylurn pipe- 



ritum of DeCandolle 28 



Prof. Boole's Solution of a Question in the Theory of Proba- 

 bilities 29 



Dr. Tyndall's Reports on the Progress of the Physical Sciences. 

 On the Conductibility of Metals for Heat. By G. Wiede- 

 mann and Pv. Franz. (With a Plate.) 33 



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



Symbolic Equation 6"= 1 40 



Mr. W. R. Grove on the Electricity of the Blowpipe Flame . . 47 



Mr. J. J. Sylvester's Note on a Point of Notation 50 



Proceedings of the Royal Society 51 



On the Products of the Decomposition of Rocks under the In- 

 fluence of Sulphurous Thermal Waters, by J. Bonis 68 



Meteorological Observations for November 1853 71 



Meteorological Observations made by Mr. Thompson at the 

 Garden of the Horticultural Society at Chiswick, near 

 London; by Mr. Veall at Boston; and by the Rev. C. 

 Clouston at Sand wick Manse, Orkney 72 



NUMBER XLIII.— FEBRUARY. 



The Rev. Prof. Callan on the Results of a series of Experiments 

 on the Decomposition of Water by the Galvanic Battery, with 



a view to obtain a constant and brilliant Lime light 73 



Mr. J. P. Gassiot on some Experiments made with Ruhmkorff's 



Induction Coil 97 



M. Delesse on the Action of Alkalies on Rocks 100 



Mr. F. C. Calvert on the Adulteration of Oils 101 



Mr. W. J. M. Rankine on the Mechanical Action of Heat {con- 

 tinued) Ill 



