BOOKS RECEIVED 



{Publishers are requested to notify prices) 



Elementary Algebra. By C. V. Durell, M.A., Part II, and R. M. Wright, M.A. 

 London : G. Bell & Sons, 1921. (Pp. xxiii + 551.) Price 5s. ^d. net. 



This volume completes the excellent introduction to algebra of which 

 the first part by Mr. Durell and Mr. Palmer was published in 1920. The 

 same method of procedure is adopted : two editions are prepared, of which 

 the one intended for the use of teachers contains a detailed introduction and 

 answers. Lengthy discussions in the text are usually of little value to the 

 ordinary boy, who needs oral instruction ; they are therefore omitted in the 

 edition which will be placed in his hands. 



Algebra is interpreted, as it should be, in a wide sense ; chapters are 

 given on limits, differentiation, integration, and empirical formulas, and there 

 is a welcome introductory account of nomography. A useful glossary and 

 index is given at the end. We have no hesitation in highly recommending 

 this book. 



Examples in Optics. Compiled by T. J. I'A. Bromwich, Sc.D., F.R.S. 

 Cambridge : Bowes & Bowes, 192 1. (Pp. 16.) Price 2s. net. 

 Dr. Bromwich has here reprinted, primarily for the use of his classes at 

 Cambridge, a useful collection of problems in Geometrical Optics ; mostly 

 taken from Mathematical Tripos Papers. 



A Treatise on Probability. By John Maynard Keynes, Fellow of King's 

 College, Cambridge. London : Macmillan & Co., St. Martin's Street. 

 192 1. (Pp. xi + 466.) Price i8s. net. 



£l6ments de la Theorie des Vecteurs et de la Geometric Analytique. By 

 Paul Appell, Membre de I'lnstitut Recteur de I'Universite de Paris. Paris : 

 Payot etCie, 106 Boulevard Saint-Germain, 192 1. (Pp.147.) Price 4 frs. 



The Fourth Dimension. By E. H. Neville, late Fellow of Trinity College, 

 Cambridge, Professor of Mathematics in University College, Reading. 

 Cambridge : at the University Press, 1921. (Pp. 55.) Price 55. net. 



A Study of Mathematical Education, including the Teaching of Arithmetic. 

 By Benchara Branford. New Edition, enlarged and revised. Oxford : 

 at the Clarendon Press, 1921. (Pp. xii + 432.) Price 7s. 6(i. net. 



An Introduction to Projective Geometry. By L. N. G. Filon, M.A., D.Sc, 

 F.R.S., Fellow of and Professor of Applied Mathematics at University 

 College, London. Third Edition. London : Edward Arnold & Co. 

 (Pp. viii + 253.) Price 7s. ^d. net. 



The Fourth Dimension Simply Explained. A Collection of Essays Selected 

 from those submitted in the Scientific American's Prize Competition. 

 With an Introduction and Editorial Notes by Henry P. Manning, Ph.D., 

 Associate Professor of Mathematics in Brown University. London : 

 Methuen & Co., 36 Essex Street, W.C. (Pp. 251.) Price 7s. 6i. net. 



Elements d' Analyse Mathematique a 1' Usage des Candidats au Certificats 

 de Math6matiques Generales des Ingenieurs et des Physiciens. Cours 

 Prof esse a I'Ecole Centrale des Arts et Manufactures par Paul Appell, 



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