CONTENTS OF VOL. III. FIFTH SERIES. Vll 



Proceedings of the Geological Society : — Page 



Prof. E. Harkness and Dr. H. A. Nicholson on the Strata 



and their Fossil Contents between the Borrowdale Series 



of the North of England and the Coniston Flags .... 392 



Mr. C. Callaway on a new Area of Upper Cambrian Eocks 



in Sonth Shropshire, with the Description of a new 



Fauna : 393 



Mr. J. D. Enys on Sandworn Stones from New Zealand. 394 

 Supplement to a Theory of the Cup-shaped Eadiometer, by 



Prof. Challis 395 



Diathermaneity of Metals and of Paper, by M. Aymonnet . . 396 

 On the Eeflection of Polarized Light, by M. Croullebois .... 397 

 Note on Molecular Volumes, by Prof. F. W. Clarke 398 



NUMBEE XX.— JUNE. 



Mr. W. M. Hicks on some Effects of Dissociation on the Phy- 

 sical Properties of Gases 401 



Mr. E. H. M. Bosanquet on the Theory of Sound 418 



Mr. J. E. Harrison's Experimental Eesearches on ; the sup- 

 posed Diathermancy of Eock-Salt. (Plate III.) 424 



Prof. E. Ecllund on the Thermal Phenomena of the Galvanic 



Pile, and Electromotive Forces . . . . f 428 



Mr. S. T. Preston on the Mode of the Propagation c^ Sound, 

 and the Physical Condition determining its Telocity, on the 



Basis of the Kinetic Theory of Gases 441 



Mr. W. J. Lewis's Crystallographic Notes. (Plate IV.) 453 



Lord Eayleigh's Acoustical Observations 456 



Notices respecting New Books : — 



Prof. W. C. TJnwin's Elements of Machine Design : 

 an Introduction to the Principles which determine the 

 Arrangement and Proportion of the Parts of Machines, 



and a Collection of Eules for Machine Design 464 



Proceedings of the Eoyal Society : — 



Mr. W. Crookes on the Theory of the Eadiometer .... 467 

 Eesearches on the Metallic Eeflection of Polarized Obscure 



Heat-Eays, by M. Mouton 477 



On the Diffusion of Vapours through Clay Cells, by Dr. J. 

 Puluj " 480 



NUMBEE XXI.— SUPPLEMENT. 



Dr. E. Bornstein on the Influence of Light upon the Electrical 



Eesistance of Metals 481 



Dr. E. J. Mills on Cumulative Eesolution 492 



Prof. E. Edlund on the Thermal Phenomena of the Galvanic 

 Pile, and Electromotive Forces 501 



