﻿CONTENTS OF VOL. XXXVIL 



(FOURTH SERIES.) 



NUMBER CCXLVL— JANUARY 1869. 



Page 

 Prof. R. Bunsen on the Washing of Precipitates. (With a Plate.) 1 



Mr. F. A. Paget on a New Form of Permanent Magnet 18 



Messrs. E. T. Chapman and M. H. Smith on the Action of De- 

 hydrating Agents on Organic Bodies 20 



M. O.E. Meyer on the Explanation of Stewart and Tait's Ex- 

 periments on the Heating of a Disk rotating in a Vacuum . . 26 

 Mr. S. Newcomb on Hansen's Theory of the Physical Consti- 

 tution of the Moon 32 



Mr. R. Edmonds on Extraordinary Agitations of the Sea not 



produced by Winds or Tides 35 



Prof. E. Edlund's Experimental Proof that the Electric Spark is 



an Electromotor 41 



Mr. H. Wilde on a Property of the Magneto-electric Current to 

 control and render Synchronous the Rotations of the Arma- 

 tures of a number of Electromagnetic Induction Machines . . 54 

 Notices respecting New Books : — 



Mr. G. Fownes's Manual of Elementary Chemistry, The- 

 oretical and Practical 62 



Dr. F. Guthrie's Elements of Heat and of Non-metallic 

 Chemistry. Especially designed for Candidates for the 

 Matriculation Pass Examination of the University of 



London 65 



Proceedings of the Royal Society : — 



Mr. B. Stewart's Account of certain Experiments on Ane- 

 roid Barometers, made at Kew Observatory . . . 65 



Mr. R. J. Wright on an Easy Method of measuring ap- 

 proximately the Intensity of Total Daylight 74 



On the Dispersive Power of Gases and Vapours, by M. Croul- 



lebois 75 



On the Generation of Ozone in Oxygen and in Air under the 

 influence of the condensed Electrical Spark, by MM. L'Hote 



and St.-Edme 79 



On a New Method of Estimating minute traces of Metals, spe- 

 cially designed for Water-analysis, by J. Alfred Wanklyn 

 and Ernest Theophron Chapman , 80 



