Vi CONTENTS OF VOL. XVIII. FOURTH SERIES. 



Page 



Mr. A. Cayley on Contour and Slope Lines 264 



M. R. Schneider on the Equivalents of Manganese and Nickel. 268 

 M. R. Schneider on Equivalents, and their Determination in 



general 272 



Dr. Wallace on the Equivalent of Bromine 279 



Lanavicensis on a Theorem in Numbers 281 



Lanavicensis on a Theorem of M. Bellavitis on the Partition of 



Numbers 283 



Dr. Atkinson's Chemical Notices from Foreign Journals .... 285 

 Proceedings of the Royal Society : — 



Mr. J. Prestwich on the Occurrence of Flint Implements, 

 associated with the Remains of Extinct Mammalia, in 



Undisturbed Beds of a late Geological Period 290 



Mr. C. Babbage on the Discovery in various Localities of 

 the Remains of Human Art mixed with the Bones of 



Extinct Races of Animals 297 



Proceedings of the Cambridge Philosophical Society : — 



Mr. Hopkins on Glacial Theories 308 



Prof. Challis on the Occultation of Saturn by the Moon on 



May S, 1859 315 



On the Density of Steam, by Prof. W. J. Macquorn Rankine . 316 



On Arsenic in Pyrites, by Henry Scholefield, Esq 317 



On the Occurrence of Gold, by Dr. F. A. Genth 318 



NUMBER CXXL— NOVEMBER. 



Prof. Challis on a Mathematical Theory of Attractive Forces.. . 321 

 Mr. T. Tate on certain remarkable Laws relating to the Cohe- 

 sion of Fluids , 335 



Mr. H. W. Elphinstone on a Method of obviating the effect 

 produced by Currents in Telegraph Wires induced by Terres- 

 trial Currents 339 



Dr. Schunck on the Phpenomena of Fermentation 340 



Mr. J. Cockle on the Theory of Equations of the Fifth Degree. 342 

 Archdeacon Pratt on the Thickness of the Earth's Crust .... 344 

 Dr. Calvert and Mr. R. Johnson on the Specific Gravities of 



Alloys 354 



Mr. R. Campbell on a Test for ascertaining whether an ob- 

 served degree of Uniformity, or the reverse, in Tables of Sta- 

 tistics is to be looked upon as remarkable 359 



Dr. Odliug on Ortho- and Meta-silicates 368 



Mr. A. Cayley on the Analytical Forms called Trees. — Part II. 374 

 Notices respecting New Books : — Mr. G. B. Jerrard's Essay on 



the Theory of Equations 378 



Proceedings of the Royal Society: — 



Dr. Hofmann on New Volatile Organic Acids from the 

 Berry of the Mountain Ash 379 



