CONTENTS OF VOL. XVIII 



(FIFTH SEEIES). 



NDMBEE CX.— JULY 1884. 



Page 

 Prof. T. Carnelley on the Periodic Law, as illustrated by 

 certain Physical Properties of Inorganic Compounds. 



(Plate I.) 1 



Frederick Guthrie on Salt-Solutions and Attached Water . . 22 

 Prof. E. Wiedemann on the Electric Discharge in Gases. 



(Plate II.) 35 



Mr. F. Trouton on Molecular Latent Heat 54 



Sir A. Campbell and Mr. W. T. Goolden on a " Speed Indi- 

 cator " for Ships' Propellors. (Plate IV.) 57 



Profs. W. E. Ayrton and J. Perry on the Gas-En gine Indi- 

 cator-Diagram. (Plate III.) 59 



Notices respecting New Books : — 



Gustav Glaser-De Cew's Magneto-elektrischen und dyna- 

 moelektrischen Maschinen ; and Eduard Japing' s 

 Elektrische Kraftiibertragung, und ihre Anwendung 



in der Praxis 77 



Mr.Cheyne's Elementary Treatise on the Planetary Theory, 



with a collection of Problems 77 



On the Magnetism of Organic Bodies, by S. Wleiigel and S. 



Henrichsen 78 



On the Manner in which the Current of an Induction Fric- 



tional Machine is affected by the Moisture, by E. Kriiger . . 80 

 Boyle's Law — a Lecture Experiment, by J. L. Andreae .... 80 



NUMBEE CXI.— AUGUST. 



Mr. H. H. Hoffert on a new Apparatus for Colour- Combina- 

 tions. (Plate V.) 81 



Prof. E. Wiedemann on the Electric Discharge in Gases 85 



Mr. E. T. Glazebrook on a Method of Measuring the Electrical 

 Capacity of a Condenser, and on the Determination by 

 Electrical Observations of the Period of a Tuning-fork . . 98 



Frederick Guthrie on Salt-Solutions and Attached Water .... 105 



