IV CONTENTS OF VOL. XLII. FOURTH SERIES. 



NUMBER CCLXXVIIL— AUGUST. 



Page 



The Hon. J. W. Strutt on the Reflection of Light from Trans- 

 parent Matter 81 



Archdeacon Pratt on Mr. Hopkins's Method of determining 



the Thickness of the Earth's Crust 98 



M. L. Schwendler on a Practical Method for detecting bad In- 

 sulators on Telegraph Lines 103 



The Astronomer Royal's Investigation of the Law of the Pro- 

 gress of Accuracy, in the usual process for forming a Plane 



Surface , 107 



Dr. E. J. Mills on Statical and Dynamical Ideas in Chemistry. 



—Part III. The Atomic Theory 112 



M. Dumas on the Constitution of Milk and Blood 129 



Canon Moseley on the Mechanical Impossibility of the Descent 



of Glaciers by their Weight only 138 



Proceedings of the Royal Society : — 



Mr. C. W. Siemens on the Increase of Electrical Resist- 

 ance in Conductors with rise of Temperature, and its 

 application to the Measure of Ordinary and Furnace 

 Temperatures ; also on a simple Method of measuring 



Electrical Resistances 150 



M. Berthelot on the Change of Pressure and Volume pro- 

 duced by Chemical Combination 152 



Proceedings of the Geological Society : — 



Lieut. -Col. Drayson on the Probable Cause, Date, and Du- 

 ration of the Glacial Epoch of Geology 155 



Mr. W. D. Herman on Allophane and an Allied Mineral 



found at Northampton 155 



Mr. J. C. Hawkshaw on the Peat and underlying Beds 

 observed in the construction of the Albert Dock, Hull. . 156 

 On the Influence of a covering of Snow on Climate, by A. 

 Wojeikof, Member of the Imperial Russian Geographical 



Society 156 



On Electro-telegraphy, by R. S. Culley, Esq 159 



On the Eruption Theory of the Corona, by W. Mattieu Williams. 1 60 



NUMBER CCLXXIX.— SEPTEMBER. 



Prof. R. Clausius on the Reduction of the Second Axiom of 

 the Mechanical Theory of Heat to general Mechanical Prin- 

 ciples 161 



Prof. R. S. Ball's Description of a Model of a Conoidal Cubic 

 Surface called the " Cylindroid," which is presented in the 

 Theory of the Geometrical freedom of a Rigid Body 181 



Canon Moseley on the steady Flow of a Liquid 184 



Prof. Cayley on a supposed new Integration of Differential 

 Equations of the Second Order 197 



