﻿CONTENTS of N° 2±6.— Fourth Series. 



I. On the Washing of Precipitates. By R. Bunsen. (With a 

 Plate.) page 1 



II. On a New Form of Permanent Magnet. By Frederick A. 

 Paget, C.E., M. Soc. Civil Engineers of France ; Corr. Mem. Franklin 

 Institute; M. late Government Commission on Chaincable- and Anchor- 

 proving Establishments 18 



III. Action of Dehydrating Agents on Organic Bodies. By E. 

 Theophron Chapman and Miles H. Smith 20 



IV. On the Explanation of Stewart and Tait's Experiments on the 

 Heating of a Disk rotating in a Vacuum. By Oscar Emil Meyer . . 26 



V. On Hansen's Theory of the Physical Constitution of the Moon. 

 By Simon Newcomb 32 



VI. On Extraordinary Agitations of the Sea not produced by Winds 



or Tides. By Richard Edmonds, Esq 35 



VII. Experimental Proof that the Electric Spark is an Electromotor. 

 By E. Edlund 41 



VIII. On a Property of the Magneto-electric Current to control and 

 render Synchronous the Rotations of the Armatures of a number of 

 Electromagnetic Induction Machines. By H. Wilde, Esq 54 



IX. Notices respecting New Books : — A Manual of Elementary 

 Chemistry, Theoretical and Practical. By George Fownes, F.R.S., 

 late Professor of Practical Chemistry in University College, London. — 

 The Elements of Heat and of Non-metallic Chemistry. Especially de- 

 signed for Candidates for the Matriculation Pass Examination of the 

 University of London. By Frederick Guthrie, B.A. (Lond.), Ph.D., 

 ■F.R.S.E., F.C.S., late Professor of Chemistry and Physics, Royal Col- 

 lege, Mauritius : 62-65 



X. Proceedings of Learned Societies : — 



Royal Society : — Mr. B. Stewart's Account of certain Ex- 

 periments on Aneroid Barometers, made at Kew Observatory ; 

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

 mately the Intensity of Total Daylight 65-75 



XI. Intelligence and Miscellaneous Articles : — 



On the Dispersive Power of Gases and Vapours, by M. Croullebois. 75 

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

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



St.-Edme 79 



On a New Method of Estimating minute traces of Metals, specially 

 designed for Water-analysis, by J. Alfred Wanklyn, Professor of 

 Chemistry in the London Institution, and Ernest Theophron 

 Chapman 80 



*** It is requested that all Communications for this Work may be addressed, 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Red 

 Lion Court, Fleet Street, London. 



