CONTENTS OF VOL. I. FIFTH SERIES. Yll 



NUMBER VI.— JUNE. 



Page 

 Dr. B. Konig on the Simultaneous Sounding of two Notes . . 417 



Mr. E. Guthrie on Salt Solutions and Attached "Water 446 



Don Enrique Serrano y Eatigati on Points in a Programme of 



Physics 455 



Mr. B. 0. Peirce, Jun. on the Induction Spark produced in 



breaking a Galvanic Circuit between the Poles of a Magnet 461 

 Mr. B. Colley on a Case of "Work produced by the Electric 



Current 469 



M. E. Pictet on the Application of the Mechanical Theory 

 of Heat to the Study of Volatile Liquids : Simple Relations 

 between the Latent Heats, Atomic Weights, and Tensions 



of Vapours. (Plate IV.) 477 



Notices respecting New Books : — 



Dr. E. S. Ball on the Theory of Screws : A Study in the 



Dynamics of a rigid body 489 



On the Polar Auroras, by G. Plante 493 



On Streams from Glaciers, by C. Knight 496 



NUMBEE VII.— SUPPLEMENT. 



Prof. G. Tschermak on the Formation of Meteorites, and 



Volcanic Agency 497 



Prof. P. E. Chase on the Nebular Hypothesis. — II. Interaction. 507 

 Dr. E. Konig on the Simultaneous Sounding of two Notes . . 511 

 Mr. L. Schwendler on the General Theory of Duplex Tele- 

 graphy 526 



M. D. Mendelejeff on the Discovery of Gallium 542 



Mr. W. H. Walenn on Unitation. — VI. Some of the Applica- 

 tions and Developments of the General Eormula (continued). 546 

 Notices respecting New Books : — 



Messrs. E. Lartet and H. Christy's 'Beliquiae Aqui- 

 tanicse,' being contributions to the Archaeology and 

 Palaeontology of Perigord, &c. Edited by Professor T. 



Eupert Jones, E.E.S., E.G.S 550 



Proceedings of the Geological Society : — 



Dr. Dawson on the Phosphates of the Laurentian and 



Cambrian Eocks of Canada 558 



Mr. H. B. Woodward on the Gravels, Sands, and other 

 Superficial Deposits in the neighbourhood of Newton- 

 Abbot 560 



Mr. E. N. Worth on certain Alluvial Deposits associated 



with the Plymouth Limestone 560 



Prof. A. C. Eamsay on the Physical History of the Dee, 



Wales 561 



Mr. J. W, Judd on the Ancient Volcano of the District 

 of Schezmitz, Hungary 562 



