CONTENTS OF VOL. XIII. FOURTH SERIES. VU 



Page 

 On the Velocity of Sound in Solids, Liquids, and Elastic Fluids, 

 and on the Correlation of the Physical Properties of Bodies, 



by A. Masson 533 



On the Improved Induction Coil, by Jonathan N. Hearder . . . 536 

 On the action of Nitric Acid upon Glycerine, by Dr. Debus. . 537 

 Analyses of the Sulphato-Carbonate of Barvtes of Thomson, by 



Dr. Heddle " 537 



Index 538 



PLATES. 



I. Illustrative of Dr. A. Matthiessen's Paper on the Electric Conducting 

 Power of the Metals of the Alkalies and Alkaline Earths. 



II. Illustrative of Dr. T. A. Hirst's Paper on Equally Attracting Bodies. 



ERRATA. 



Page 138, line 5 from bottom, /or sin 6 read cos 6. 



— 141, ■ — 3 from bottom, /or 4>2 — (^) rend —(ji-ii^)- 



— 141, — 2 from bottom,/or fi{e) + i^i{S) read ^i{6)—f-2{B). 



— 288, — 21 from top, /or the part rend the narrow ))art. 



— 289, — I, for 2(i8° read 238"^. 



— 289, — 3 from top, for 19° read 4'.)°. 



