Geological Society. 647 



Coups de Physique. Par H. Bouasse. Premiere Partie. 

 Jleeanique Physique. Paris : Ch. Delagrave. Pp. 23(5. 



Xo intelligent study of physical problems is possible without a 

 thorough understanding of the fundamental principles of dynamics, 

 and any student who intends takiug the study of physics seriously 

 will do well not to shrink from the severe mental discipline by 

 the exercise of which alone a really thorough insight into the 

 principles and methods of dynamics can be obtained. The author 

 of the book under review, which forms the first part of a treatise 

 on physics, has therefore done well to devote to dynamical 

 principles the comparatively large amount of space which the 

 importance of the subject fully warrants. The work is not 

 intended for the beginner. A knowledge of elementary dynamics, 

 and of differentiation, integration, and co-ordinate geometry is 

 assumed on the part of the reader. The subjects dealt with 

 include the general principles of dynamics, the general properties 

 of fluids, capillarity, fluid motion, viscosity, the transmission of 

 waves through a compressible fluid, hydrodynamics, the deformation 

 of perfectly elastic solids, the elements of the theory of elasticity 

 for isotropic solids, permanent deformations, friction, the 

 equilibrium of strings, vibrations of strings, resonance, and 

 vibrations of rods. The treatment is excellent in every way, 

 being characterized by clearness and brevity, and due stress 

 being always laid on the purely physical aspect of each of the 

 problems dealt with. We can warmly recommend to all advanced 

 students this very concise and elegantly written guide to a 

 subject of fundamental importance in physical science. 



LYII. Proceedings of Learned Societies. 



GEOLOGICAL SOCIETY. 

 [Continued from p. 288.] 



November 21st, 1906.— Sir Archibald Geikie, D.C.L., Sc.D., 



Sec.R.S., President, in the Chair. 



r PHE following communications were read : — 



1. ' The Kimeridge Clay and Corallian Rocks of the Neigh- 

 bourhood of Brill (Buckinghamshire).' Bv Arthur Morley Davies, 

 A.B.C.S., B.Sc, F.G.S. 



The paper contains two principal divisions : — 



(1) An account of the section of Pad's Hill, Brill. At the 

 summit are Lower Portlandian sands, not well exposed : below 

 these comes a thickness of about 50 feet of Upper Kimeridge Clay, 

 with only one small exposure of grey shale containing black lignite 



