CONTENTS OF VOL. XVI. FIFTH SERIES. V 
Page 
Mr. T. Gray on the Size of Conductors for the Distribution of 
Electric Energy 187 
Prof. W. C. Bb'ntgen on the Thermoelectric, Actinoelectric, and 
Piezoelectric Properties of Quartz 194 
Prof. H. A. Eowland on Concave G-ratings for Optical Pur- 
poses '. 197 
Prof. H. A. Eowland on Mr. Glazebrook's Paper on the Aberra- 
tion of Concave Gratings 210 
Dr. Lucien I. Blake on the Production of Electricity by Eva- 
poration, and on the Electrical Neutrality of Vapour arising 
from electrified Still Surfaces of Liquids 211 
Capt. Abney and Lieut.-Col. Eesting's Investigation into the 
Eelations between Eadiation, Energy, and Temperature . . 224 
Prof. J. J. Sylvesters Table of Totients, of Sum-totients, and 
of 3/tt 2 into the Squares, of all the Xumbers from 501 to 
1000 inclusive 230 
Notices respecting New Books : — 
In Memoriam Dominici Chelini 233 
Proceedings of the Geological Society : — 
Mr. A. J. Jukes-Browne on the Eelative Age of some 
Yalleys in Lincolnshire 237 
Messrs. Tawnev and Keeping on the Section at Hordwell 
Cliffs 238 
Mr. H. J. Johnston-La vis on the Geology of Monte 
Somma and Vesuvius 239 
Mr. J. Young on " Cone-in-Cone " Structure 239 
Mr. A. Morris's Geological Sketch of Quidong, Manaro, 
Australia 239 
On Eadiometers, by George Erancis Eitzgerald 240 
NLMBEE C— OCTOBEE. 
Dr. J. Croll on some Controverted Points in Geological 
Climatology : a Eeply to Professor Newcomb, Mr. Hill, and 
others ' * 241 
Mr. E. Waldo on Mr. Heath's Criticism of Eerrel's Theory of 
Atmospheric Currents 264 
Prof. J. J. Sylvester on the Equation to the Secular Inequalities 
in the Planetary Theory 267 
Mr. A. Tribe on the Influence of the Direction of the Lines of 
Eorce on the Distribution of Electricity on Metallic Bodies. 269 
Mr. L. Eletcher on the Dilatation of Crystals on Change of 
Temperature. — Part I. (Plate III.) 275 
Mr. F. Y. Edgeworth on the Law of Error ■ 300 
Lord Bayleigh on Laplace's Theory of Capillarity 309 
