CONTENTS OF VOL. XLVI. FIFTH SERIES. Vll 



Page 

 Mr. G. F. Franks and Prof. J. B. Harrison on the Glo- 



bigerina-mavls of Barbados 505 



Mr. T. Mellard Eeade on the Post-Glacial Beds exposed 



in the Cutting of the New Bruges Canal ; and on the 



High-level Marine Drift at Colwyn Bay 506 



Dr. R. Kcettlitz on the Geology of Franz Josef Land . . 507 

 Messrs. E. T. Newton and J. J. H. Teall on Bocks and 



Fossils from Franz Josef Land 508 



Mr. C. B. Wedd on the Corallian Rocks of Upware 508 



NUMBEK CCLXXXIIL— DECEMBER. 



Prof. J. G-. MacGregor and Mr. E. H. Archibald on the Con- 

 ductivity-Method of Studying Moderately Dilute Aqueous 

 Solutions of Double Salts . . . 509 



Mr. E. G. Coker on Instruments for Measuring Small Strains 

 in Bars subjected to Twist 520 



Prof. J. J. Thomson on the Charge of Electricity carried by 

 the Ions produced by Rontgen Rays 528 



Prof. W. McF. Orr on the Forced Precession and Nutations 

 of a Rotating Ellipsoidal Shell containing Liquid 545 



Mr. James Walker on the Orientation of the Slit in Inter- 

 ference Experiments 553 



Dr. J. H. Vincent on the Construction of a Mechanical Model 

 to Illustrate Hehnholtz's Theory of Dispersion 557 



Mr. W. R. Pidgeon on an Influence-Machine 564 



Lord Rayleigh on Iso-periodic Systems 567 



Notices respecting New Books : — 



Prof. A .Righi's Die Optik derElectrischen Schwingungen. 570 

 Skertchly's Geology, revised by James Monckman .... 570 



A New Combination of Wheel-gearing, by J. J. Taudin 

 Chabot 571 



On the Susceptibility of Diamagnetic and "Weakly Magnetic 

 Substances, by Prof. G. Quincke 572 



Index 573 



