CONTENTS OF VOL. XVII. FOURTH SERIES. Vll 



Page 

 Mr. W. J. M. Rankine's Note to a Letter "On the Conservatioa 



of Energy " 347 



Prof. Knoblauch on the Connexion between the Structure and 



the Physical Properties of Wood 348 



Prof. Challis on the Resistance of the Luminiferous Medium to 



the Motions of Planets and Comets 352 



Mr. J. Cockle on the Theory of Equations of the Fifth Degree. 356 

 Prof. Forbes on certain Vibrations produced by Electricity . . 358 

 Proceedings of the Royal Society: — 



Dr. Hofmann on Phosphoretted Ureas 360 



Dr. Joule on the Thermal Effects of Compressing Fluids. . 364 

 Mr. L. Thomas on the Nature of the Action of Fired 



Gunpowder 366 



Dr. Hofmann on the History of the Monamines 368 



Mr. P. Griess on New Nitrogenous Derivatives of the 



Phenyle- and Benzoyle-series 370 



Proceedings of the Geological Society : — 



Prof. Huxley on some Amphibian and Reptilian Remains 



from South Africa and Australia 373 



Prof. Huxley on Rhamphorhynchus BucMandi 3^4 



Prof. Huxley on a Fossil Bird and a Fossil Cetacean from 



New Zealand 375 



Prof. Huxley on the Dermal Armour of Crocodilus Has- 



tingsicE 375 



Dr. Wright on the Subdivisions of the Inferior Oolite in 



the South of England 376 



Prof. Owen on some Reptilian Remains from South Africa. 378 

 Mr. E. Hull on the South-easterly Attenuation of the Lower 



Secondary Rocks of England 381 



On the Phosphorescence of Gases by the Action of Electricity, 

 by E. Becquerel 383 



NUMBER CXVL— JUNE. 



Dr. Gladstone on the Periods and Colours of Luminous Meteors. 385 



M. Buff on the Law of Electrolytic Conduction 394 



Prof. Haughton on the Thickness of the Earth's Crust 397 



Mr. G. Gore on an Apparatus for examining the Electrical 

 relations of unequally heated Mercury and Fluid Alloys in 



conducting Liquids. (With a Plate.) 398 



Prof. Challis's Theoretical Considerations respecting the rela- 

 tion of Pressure to Density 401 



Prof. Erman on the Structure, the Melting, and the Crystalli- 

 zation of Ice - 405 



Prof. Dove on the Stereoscopic representation of Pnnt as it 

 appears when viewed with both eyes tlirough Double-refract- 

 ing si)ar 414 



