VI CONTENTS OF VOL. XIII. FIFTH SERIES. 



Page 

 Messrs. C. F. Cross and E. J. Bevan on Pseudo-Carbons .... 325 

 Prof. Piazzi Smyth on the Constitution of the Lines forming 



the Low-Temperature Spectrum of Oxygen 330 



Mr. J. Maefarlane Gray on Regnault's Determination of the 



Specific Heat of Steam 337 



Lord Rayleigh's Acoustical Observations. — IV 340 



Mr. Shelf ord Bidvvell on the Effect of Temperature on the 



Electrical Resistance of Mixtures of Sulphur and Carbon. . 347 

 Dr. William Spottiswoode ou a Separator and a Shunt for alter- 

 nate Currents of High Tension. (Plate IX.) 353 



Sir James Cockle on Transformation . 357 



Messrs. W. Chandler Roberts and T. Wrightson on the Fluid 



Density of certain Metals. (Plate VII.) 360 



Notices respecting New Books : — 



Prof. Brauns's Geology of the Environs of Tokio 367 



Messrs. Burnside and Panton's Theory of Equations ; with 

 an Introduction to the Theory of Binary Algebraic 



Forms 368 



The Rev. T. W. Webb's Celestial Objects for Common 



Telescopes 368 



Proceedings of the Geological Society : — 



Messrs. E. W. Binney and J. W. Kirkby on the Upper 



Beds of the Fifeshire Coal- Measures 369 



Mr. D. Mackintosh on Additional Discoveries of High- 

 level Marine Drifts in North Wales, with Remarks on 



Driftless Areas 370 



Mr. H. Keeping on some Sections of Lincolnshire Neo- 



comian 371 



Mr. C. T. Clough on the Geology of the Cheviot Hills 



(English side) 371 



Mr. J. A. Phillips on certain Inclusions in Granite .... 372 



Mr. J. S. Gardner on the Geology of Madeira 372 



Mr. T. F. Jamieson on the Red Clay of the Aberdeenshire 

 Coast, and the Direction of the Ice-movement in that 



quarter 372 



Prof. J. D. Dana on the Geological Age of the Taconic 



System 373 



Prof. T. G. Bonney on some Nodular Felsites in the Bala 



Group of North Wales 374 



Mr. J. E. Marr on the Cambrian (Sedgw.) and Silurian 



Rocks of Scandinavia 374 



On the Dimensions of a Magnetic Pole m the Electrostatic 



System of Units, by Prof. J. D. Everett 376 



On the Electrolysis of Distilled Water, by D. Tommasi 377 



A little Illusion, by J. Plateau 379 



