BOOKS RECEIVED 685 



pletely revised. London: Macmillan & Co., St. Martin's Street, 1921. 

 (Pp. xii + 268.) Price 305. net. 

 Multilinear Functions of Direction and their Uses in Differential Geometry. 

 By Eric Harold Neville, Professor of Mathematics in University College, 

 Reading. Cambridge: at the University Press, 192 1. (Pp.80.) Price 

 8s. bd. net. 

 fitude Geometrique des Transformations Birationelles et des Courbes Planes. 

 Par Henri Malet, Ingenieur des Ponts et Chauss :es. Paris : Gauthier- 

 Villars et Cie, 55 Quai des Grands- Augustins, 192 1. (Pp. viii + 261.) 

 Price 32 frs. net. 

 Principles of Geometry. By H. F. Baker, Sc.D., F.R.S., Lowndean Professor 

 of Astronomy and Geometry, and Fellow of St. John's College, in the 

 University of Cambridge. Cambridge : at the University Press, 1922. 

 (Pp. xi + 183.) Price 12s. net. 

 Practical Least Squares. By Ora Miner Leland, B.S., C.E., Dean of the College 

 of Engineering and Architecture and the School of Chemistry, University 

 of Minnesota. New York : McGraw-Hill Book Company ; London : 

 6 and 8 Bouverie Street, E.C., 1921. (Pp. xiv + 237.) Price 15s. net. 

 The Emission of Electricity from Hot Bodies. By O. W. Richardson, F.R.S., 

 Wheatstone Professor of Physics, King's College, London. Second 

 Edition, with diagrams. London : Longmans, Green & Co., 39 Pater- 

 noster Row, 1921. (Pp. viii + 320.) Price 165. net. 

 Mdmoires sur I'filectromagnetisme et I'filectrodynamique. Par Andre- 

 Marie Ampere. Paris : Gauthier-Villars et Cie, 55 Quai des Grands- 

 Augustins, 1921. (Pp. xiv + no.) 

 ■ Rays of Positive Electricity and their Application to Chemical Analyses. 

 By Sir J. J. Thomson, O.M., F.R.S., Master of Trinity College, Cam- 

 bridge, Professor of Experimental Physics, Cambridge. Second Edition. 

 London: Longmans, Green & Co., 39 Paternoster Row, 1921. (Pp. 

 X +234, with 9 plates and 42 figures.) Price 165. net. 

 Philosophy and the New Physics. An Essay on the Relativity Theory and 

 the Theory of Quanta. By Louis Rougier, Professeur Agr6g6 de Philo- 

 sophic, Docteur es Lettres. Authorised Translation from the Author's 

 Corrected Text of " La Materialisation de I'finergie," by Morton Masius, 

 M.A., Ph.D., Professor of Physics in the Worcester Polytechnic Institute. 

 Philadelphia: P. Blackiston's Son & Co., 1012 Walnut Street. (Pp. 

 XV + 159.) 

 La Physique Theorique Nouvelle. Par Julien Pacotte, Docteur es Sciences. 

 Preface de M. fimile Borel, Membre de I'lnstitut. Paris : Gauthier- 

 Villars et Cie, 55 Quai des Grands-Augustins, 1921. (Pp. vii + 182.) 

 Elements d'filectricite. Par Charles Fabry, Professeur a la Sorbonne. 

 Paris : Librairie Armand Colin, 103 Boulevard Saint-Michel. (Pp. 

 viii + 199.) Price 5 frs. 

 Statique et Dynamique H. Par Henri Beghin, Professeur al'ficole Navale. 

 Paris : Librairie Armand Colin, 103 Boulevard Saint-Michel. (Pp. 208.) 

 Price 5 frs. 

 Ions, Electrons, and Ionising Radiations. By James Arnold Crowther, 

 Sc.D., F.Inst. P., University Lecturer in Physics as Applied to Radiology, 

 University Demonstrator in Experimental Physics in the Cavendish 

 Laboratory, Cambridge. Third Edition. London : Edward Arnold 

 8c Co., 1922. (Pp. xii + 292.) Price 12s. 6d. net. 

 Elementary Chemical Microscopy. By fimile Monnin Channot, B.S., Ph.D., 

 Professor of Chemical Microscopy and Sanitary Chemistry, Cornell 

 University. Second Edition, partly rewritten and enlarged. New 

 York: John Wiley & Sons; London: Chapman & Hall, 1921. (Pp. 

 XV + 479, with 160 diagrams.) Price 25s. net. 

 A Textbook of Inorganic Chemistry. By A. F. Holleman, Ph.D., LL.D., 



