CONTENTS OF VOL. XXXIV. FIFTH SERTES. Vll 



Page 

 Prof. F. Y. Edgeworth on the Law of Error and Correlated 



Averages 429 



Dr. W. Pole : Further Data on Colour-Blindness.— No. II. 439 

 Lord Kelvin on Graphic Solution of Dynamical Problems . . 443 

 Notices respecting New Books : — 



Nietzki's Chemistry of the Organic Dyestuffs 448 



Dr. Lodge's Lightning Conductors and Lightning Guards 451 



Dr. Hull's Volcanoes, Past and Present 452 



Dr. A. Maefarlane's Principles of the Algebra of Physics 453 



Watts' Dictionary of Chemistry, Vol. Ill 454 



On the Colour of Ions, by W. Ostwald 457 



On the Physical Signification of b in Van der AVaals' Equation, 



by E. Heilborn 459 



On the Theory of the Use of a Permanently Magnetized Core 

 in the Telephone, by J. W. Giltay 460 



NUMBER CCXI.— DECEMBER. 



Mr. A. P. Chattock on an Electrolytic Theory of Dielectrics . 461 

 Lord Rayleigh on the Influence of Obstacles arranged in 



Rectangular Order upon the Properties of a Medium 481 



Dr. Sydney Young on the Determination of the Critical 



Volume 503 



Dr. S. Young and Mr. G. L. Thomas on the Determination 



of the Critical Density 507 



Dr. S. Young on the Boiling-points of different Liquids at 



Equal Pressures 510 



Messrs. E. H. Griffiths and G. M. Clark on the Determination 



of Low Temperatures by Platinum-Thermometers 515 



Prof. F. Y. Edgeworth on the Law of Error and Correlated 



Averages 518 



Notices respecting New Books : — 



Dr. E. J. Routh's Treatise on Analytical Statics 527 



The Effects of Self-induction and Distributed Static Capacity 



in a Conductor, by Frederick Bedell, Ph.D., and Albert C. 



Crehore, Ph.D 528 



Experiments on the Conductivity of Insulating Bodies, by M. 



Edouard Branly, M.D 530 



On the Theory of Magnetization, by Prof. Dr. Wassmuth . . 531 



Index 532 



