CONTENTS OF VOL. XVI. — FOURTH SERIES. V 



Page 

 The Astronomer Royal on the treatment of some Geome- 

 trical Problems 231 



Prof. De Morgan on a Proof of the existence of a Root in 



every Algebraic Equation 232 



Proceedings of the Geological Society : — 



Mr. J. Prestwich on the Pleistocene Sea-bed of the Sussex 



Coast 233 



Dr. J. J. Bigsby on the Palaeozoic Fossils of the State of 



New York 234 



Prof. Harkness on Jointings, and on the Dolomites near 



Cork 235 



Mr. W. Hawkes on an Experiment in melting and cooling 



some of the Rowley Rag 236 



Mr. W. Smyth on the Iron Ores of Exmoor 236 



Captain W. Vivian on Native Copper in the Llandudno 



Mine, North Wales 237 



Prof. J. Nicol on the Slate-rocks and Trap-veins of Easdale 



and Oban 238 



On the Resistance of Ships, by Prof. W. J. Macquorn Rankine. 238 

 Observations on the Native Phosphates of Copper, by Prof. 



Bergemann 239 



On the Euphotides of Mt. Rose, by T. Sterry Hunt, Esq 240 



NUMBER CVIL— OCTOBER. 



Prof. Hennessy on the Distribution of Heat over Islands, and 



especially over the British Isles 241 



Dr. Simpson on a New Base obtained by the Action of Am- 

 monia on the Terbromide of AUyle 257 



Mr. A. B. Northcote on the Constitution of Thermophyllite . . 263 



Dr. Hirst on Equally Attracting Bodies (^concluded) 266 



MM. Deville and Leblanc on the Gaseous Emanations which 

 accompany the Boracic Acid in the Lagoons of Tuscany . . 284 



Prof. Miller on some Crystallized Furnace Products 292 



Dr. Atkinson's Chemical Notices from Foreign Journals 295 



Proceedings of the Royal Society : — 



Mr. J. Jago on the Functions of the Tympanum 298 



Prof. W. Thomson on the Interior Melting of Ice 303 



Captain Moorsom on the Practical Use of the Aneroid Ba- 

 rometer as an Orometer 304 



Mr. J. P. Gassiot on the Stratifications and Dark Bands 

 in Electrical Discharges as observed in Torricellian 



Vacuums 305 



Dr. Hofmann on the Poly-ammonias 309 



Proceedings of the Cambridge Philosophical Society : — 



Prof. De Morgan on the Syllogism, No. III., and on 

 Logic in general 313 



