Geological Society, 321 



elasticity of crystals, deformation of solids, constitution of alloys, 

 properties of solids under pressure, fusion and crystallization, 

 rigidity of liquids, capillary phenomena, diffusion of gases, osmosis, 

 kinetic theory of gases, critical constants and specific heats of 

 gases. 



Vol. II., which opens with a paper by Lord Kelvin " On the 

 Motion of an Elastic Solid traversed by a Body Acting on it by 

 Attraction or Repulsion," is a collection of memoirs on Light, 

 Electricity, and Magnetism, and contains papers on radiation, 

 dispersion, velocity of light and electromagnetic waves, mode of 

 energy propagation in the electromagnetic field, Hertzian waves, 

 coherers, electrolytic dissociation, standards of E.M.E., electro- 

 chemical equivalents of silver, copper, and hydrogen, hysteresis, 

 magnetostriction, and physical changes due to magnetization. 



Vol. III. is devoted to physical problems of comparatively recent 

 origin, and deals with a wide range of subjects of surpassing 

 interest, among which may be mentioned recent theories of 

 magneto-optic phenomena, theory of dispersion in metals, radio- 

 active substances, cathode-rays, J. J. Thomson's suggestions re- 

 garding the constitution of matter, counter-E.M.F. of electric arc, 

 polyphase currents, oscillographs, constant of gravitation, glaciers, 

 atmospheric electricity, solar physics, biological physics. 



A mere enumeration of the subjects dealt with is sufficient to 

 show the importance of the work under review ; and since all the 

 papers have been contributed by specialists of acknowledged 

 eminence, the work is one which probably few students of physics 

 would care to be without. As a work of reference it is bound to 

 find a place in every physical library worthy of the name. 



XXXII. Proceedings of Learned Societies. 



GEOLOGICAL SOCIETY. 



[Continued from p. 160.] 



April 24th, 1901.— J. J. H. Teall, Esq., M.A., F.R.S., 

 President, in the Chair. 



^HE following communications were read : — 



-*- 1. * Notes on two Well-Sections.' By the Rev. R. Ashington 



Bullen, B.A., P.L.S., F.G.S. 



The well-section at Southwark passes through sand and gravel, 

 etc. 34 feet, London Clay 75 feet, Woolwich and Reading Beds 

 56 feet 9 inches and Thanet Sand 36 feet 6 inches, into Chalk which 

 was bored to a depth of 148 feet. 



The well-section at Dallinghoo Post-Office, near Wickham 

 Market (Suffolk), penetrated 53 feet of blue Chalky Boulder-clay, 

 into 20 feet of Sand and Gravel, water being found at a depth of 

 79 feet. Liassic and Oxford Clay fossils were found in the Boulder- 

 clay and stones, one of which is considered by Prof. T. Rupert Jones 



