VI CONTENTS OF VOL. XLVIII. FIFTH SERIES. 



Notices respecting New Books : — ■_ p age 



Prof. G. Lippmann's Unites JElectriques absolues 393 



Prof. Alex. McAulay's Octonions, a Development of 



Clifford's Bi- Quaternions 394 



H. Arthur Korn's ' Abhandlung iiber Dynamik, von 



D'Alembert ' 395 



Mr. W. R. P. Hobbs's The Arithmetic of Electrical 



Measurements 396 



Proceedings of the Geological Society : — 



Messrs. James Park and Frank Rutley on the Ehyolites 



of the Hauraki G-oldfields (New Zealand) 396 



Mr. J. B. Hill on the Progressive Metamorphism of 



some Dalradian Sediments in the Region of Loch Awe. 397 

 Mr. P. A. Bather on a Quartzite Pebble from Bowdon, 



Cheshire 398 



Mr. C. A. Matley on the Geology of Northern Anglesey. 399 

 Mr. John Parkinson on an Intrusion of Granite into 



Diabase at Sorel Point (Northern Jersey) 399 



Vallauri Prize 400 



NUMBER CCXCIV.— NOVEMBER. 



Prof. A. P. Chattock on the Velocity and Mass of the Ions in 

 the Electric Wind in Air 401 



Prof. D. B. Brace on a New Spectrophotometer and an 

 Optical Method of Calibration 420 



Dr. R. A . Lehfeldt on the Theory of the Electrolytic Solution- 

 Pressure 430 



Mr. R. S. Willows on the Variation of the Resistance of 

 certain Amalgams with Temperature 433 



Dr. G. Johnstone Stoney : Survey of that part of the 

 range of Nature's Operations which Man is competent to 

 Study 457 



Mr. W. C. D. Whetham on the Coagulative Power of Electro- 

 lytes 474 



Prof. P. J. Jervis-Smith on the Effect of Heat on the Discharge 

 of an Induction-Coil, in which the Primary Circuit is inter- 

 rupted by au Electrolytic Break 477 



Hon. R. J. Strutt on the Dispersion of the Cathode Rays by 

 Magnetic Porce 478 



Mr. A. Hutchinson on Stokesite — a New Mineral from Corn- 

 wall 480 



Dr. Walter Stewart on the Disintegration of Platinum and 

 Palladium Wires at High Temperatures 481 



Notices respecting New Books : — 



Prof. A. Reychler's Outlines of Physical Chemistry .... 484 



