CONTENTS OF VOL. XXXVIII. FOURTH SLiilliS. Vll 



Page 

 Mr. J. W. Judd on the Origin of the Northampton Sand. 400 

 Prof. H. Coquand on the Cretaceous Strata of England and 



the North of France 40 



Mr. W. Carruthers on the Structure and Affinities of Si- 



gillaria and allied genera 402 



Dr. H. A. Nicholson on the British Species of the Genera 

 ClimacograpsuSy Diplograpsus, Dicranograpsus, and Di- 



dymograpsus 402 



Mr. F. O. Adams on the Coal-mines at Kaianoma .... . . 402 



Mr. M. Morgans on a peculiarity of the Brendon-Hills 



Spathose Ore-veins " 403 



On the Emission and Absorption of Heat radiated at Low Tem- 

 peratures, by G. Magnus 403 



On the limits of the Magnetization of Iron and Steel, by Prof. 



A. Waltenhofen 404 



On the Reflection of Heat from the surface of Fluor-spar and 



other Bodies, by G. Magnus 405 



On the Luminous Effects produced by Electrostatic Induction in 

 Rarefied Gases. — Leyden Jar with Gaseous Coatings, by M. 

 F. P. Le Roux 407 



NUMBER CCLVIL— DECEMBER. 



Mr. C. Tomlinsonon the Motions of Camphor on the Surface of 

 Water 409 



Prof. A. Kenngott's Microscopical Investigation of thin polished 

 Laminse of the Knyahynia Meteorite. (With a Plate.) .... 424 



Mr. W. H. Preece on the Parallelogram of Forces 428 



Prof. F. Kohlrausch on the Determination of the Specific Heat 

 of Air under constant Volume by means of the Metallic Ba- 

 rometer 430 



M. Abich on Fulgurites in the Andesite of the Lesser Ararat, and 

 on the Influence of Local Agents on the Production of Thun- 

 derstorms 436 



M. Abich on Hailstorms in Russian Georgia. (With a Plate.) 440 



Mr. T. T. P. B. Warren on Electrification 441 



Prof. J. Plateau's Experimental and Theoretical Researches 

 into the Figures of Equilibrium of a Liquid Mass without 

 Weight. — Eighth Series 445 



Dr. W. Odling on a Theory of Condensed Ammonia Compounds. 455 



Notices respecting New Books : — 



M.J. G. Fitch's Methods of teaching Arithmetic. — Dr. J. 

 Cornwell and Mr. J. G. Fitch's School Arithmetic, and 

 the Science of Arithmetic 457 



Proceedings of the Royal Society : — 



Mr. T. Graham on Hydrogenium 459 



