CONTENTS OF VOL. XXI 



(FIFTH SERIES). 



NUMBER CXXVIIL— JANUARY 1886. 



Page 

 Dr. Silvanus P. Thompson on the Law of the Electromagnet 



and the Law of the Dynamo 1 



Lord Rayleigh on Prof. Himstedt's Determination of the Ohm. 10 

 Mr. E. F. Herroun on the Electromotive Eorce of certain Tin 



Cells 13 



Mr. "W. M. Mordey on the Dynamo as a Generator and as a 



Motor. Some Analogies and Contrasts 20 



Mr. G. "W. "Whipple on the Verification of Thermometers at 



the Ereezing-point of Mercury 27 



Mr. T. Mather on the Calibration of Galvanometers by a Con- 

 stant Current 29 



Drs. W. Ramsay and S. Young on some Thermodynamical 



Relations.— Part II 33 



Profs. Ayrton and Perry on Dr. Lodge's Paper on The 



Seat of the Electromotive Eorces in a Voltaic Cell 51 



Mr. R. Moon on the Integration of Partial Differential Equa- 

 tions of the Third and Higher Orders 63 



Dr. "W. W. J. Nicol on Saturation of Salt-solutions. — Part II. 70 

 Proceedings of the Geological Society : — 



Mr. W. Whitaker on some Borings in Kent. — A Contri- 

 bution to the Deep-seated Geology of the London Basin. 77 

 Mr. E. A. Bather on some Recent Openings in the Liassic 

 and Oolitic Rocks of Eawler in Oxfordshire, and on 

 the Arrangement of those Rocks near Charlbury .... 78 

 Experimental Proof of the Law that both Electricities are 

 Developed at the same Time and in the same Quantities, for 



Pyroelectricity, by E. Dorn 78 



A New Eorm of Absorption-cell, by Arthur E. Bostwick .... 80 

 On the Cooling of a "Wire when Stretched, by E. Dorn .... 80 



NUMBER CXXIX.— FEBRUARY. 



Mr. C. Chree on Bars and Wires of varying Elasticity 81 



Profs/W. E. Ayrton and J. Perry on the Winding of Voltmeters. 100 

 Dr. J. J. Hood on the Theory of Eractional Precipitation . . 119 



