CONTENTS OF VOL. VII.— FIFTH SERIES. Vll 



Pag© 

 Tube to find the true Wave-length, and the Velocity of 



Sound in small Tubes 339 



Prof. P. G. Tait on the Dissipation of Energy 344 



Sir W. Thomson on Thermodynamic Motivity 348 



Dr. C. W. Siemens on the Transmission and Distribution of 



Energy by the Electric Current. (Plate XII.) 352 



Messrs. Wanklyn and Cooper on the Products of the Oxida- 

 tion of Wool — Cyano-propionic Acid 356 



Notices respecting New Books : — 



M. A. Terquem's Sur les Courbes dues a la Combinaison 



de deux Mouvements vibratoires perpendiculaires .... 365 

 American Journal of Mathematics, Pure and Applied . . 366 

 Proceedings of the Geological Society : — 



Mr. D. Mackintosh on the Directions and Limits of Dis- 

 persion, Mode of Occurrence, and Relation to Drift- 

 deposits of the Erratic Blocks or Boulders of the West 



of England and East of Wales 367 



Messrs. Peach and Home on the Glaciation of the Shet- 

 land Isles 367 



Mr. A. J. Jukes-Browne on the Southerly Extension of the 



Hessle Boulder-clay in Lincolnshire 368 



Prof. E. Hull on the Greological Age of the " Dingle Beds " 



and " Glengariff Grits" 368 



Mr. W. J. Sollas on some Three-toed Footprints from the 

 Triassic Conglomerate of South Wales, and on the Silu- 

 rian District of Rhynmey and Pen-y-lan, Cardiff .... 369 

 On the Optical Properties of Starch, by Viktor v. Lang .... 370 

 On the Magnetic Rotatory Power of Vapours, by E. Bichat . . 371 



On an Electrical Burner and Blowpipe, by M. Jamin 372 



On the Electrical Perforation of Glass, by Prof. A. von Walten- 



hofen 374 



On the Pressures exerted by Galvanic Deposits, by M. Bouty . . 375 

 New Estimate of the Sun's Distance, by Pliny Earle Chase, LL.D. 377 

 Contribution to the Theory of the Microphone, by Hermann 



Aron 377 



On the Variation of the Thermal Conductivity of Metals with 

 Temperature, by Oliver J. Lodge 380 



NUMBER XLV.— JUNE. 



Mr. 0. Fisher on the Thermal Conditions and on the Stratifi- 

 cation of the Antarctic Ice 381 



Dr. A. R. Leeds on the Action of Light upon the Soluble 

 Iodides, with the Outlines of a New Method in Actinometry 393 



Professors J. Perry and W. E. Ayrton on a new Theory of 

 Terrestrial Magnetism 401 



Mr. F. D. Brown on the Maintenance of Constant Pressures 

 and Temperatures. (Plate XIII.) 411 



