BOOKS RECEIVED 



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The Theory of Functions of a Real Variable and the Theory of Fourier's 

 Series. By E. W. Hobson, Sc.D., LL.D., F.R.S., Sadleirian Professor 

 of Pure Mathematics and Fellow of Christ's College in the University of 

 Cambridge. Second Edition, revised throughout and enlarged. Vol. I. 

 Cambridge : at the University Press, 192 1. (Pp. xvi + 671.) Price 

 455. net. 



Lectures on the Principle of Symmetry, and its Applications in all Natural 

 Sciences. By F. M. Jaeger, Ph.D., Professor of Inorganic and Physical 

 Chemistry in the University of Groningen, Netherlands. Second Aug- 

 mented Edition. Amsterdam : Publishing Company " Elsevier," 1920. 

 (Pp. xii + 348, with 173 diagrams and 3 portraits.) 



The Elementary Differential Geometry of Plain Curves. By R. H. Fowler, 

 M.A., Fellow of Trinity College, Cambridge. Cambridge: at the 

 University Press, 1920. (Pp. vii + 105.) Price 6s. 6(i. net. 



The D5mamics of the Airplane. By Kenneth P. Williams, Ph.D., Associate 

 Professor of Mathematics, Indiana University. Mathematical Mono- 

 graphs, edited by Mansfield Merriman and Robert S. Woodward. No. 

 21. New York : John Wiley & Sons ; London : Chapman & Hall, 192 1. 

 (Pp. viii + 138.) Price 135. bd. 



The Mechanical Principles of the Aeroplane. By S. Brodetsky, M.A., Ph.D., 



F.Inst. P., A.F.R.Ae.S., Reader in Applied Mathematics, University of 



Leeds. London : J. and A. Churchill, 7 Great Marlborough Street, 1921. 



(Pp. vii + 272, with 119 illustrations.) Price 215. net. 

 Format's Last Theorem. Proofs by Elementary Algebra. By M. Cashmore. 



Third Edition. London: G. Bell & Sons, 1921. (Pp.67.) Price2s.6i.net. 

 Calculus for Beginners. A Text-book|for Schools and Evening Classes. By 



H. Sydney Jones, M.A., Head Master, Barnstaple Grammar School. 



London : Macmillan & Co., St. Martin's Street, 192 1. (Pp. ix + 300.) 



Price 6s. net. 



Meteorology. An Introductory Treatise. By A. E. M. Geddes, O.B.E., M.A., 

 D.Sc, Lecturer in Natural Philosophy in the University of Aberdeen. 

 London : Blackie & Sons, 50 Old Bailey, 192 1. (Pp. xx + 390, with 20 

 plates and 103 diagrams.) Price '21s. net. 



Periodic Orbits. By F. R. Moulton, in Collaboration with Daniel Buchanan, 

 Thomas Buck, Frank L. Griffin, William R. Longley, and William D. 

 MacMillan. Washington : The Carnegie Institution of Washington, 

 1920. (Pp. xiii -f 524.) 



The Elements of Theoretical and Descriptive Astronomy for the Use of 

 Colleges and Academies. By Charles J. White, A.M. Third Edition, 

 revised by Paul P. Blackburn, Commander U.S. Navy. New York : John 

 Wiley & Sons ; London : Chapman & Hall, 1920. (Pp. xi + 309, with 

 9 plates and 84 figures.) Price 17s. 6d. net. 



Relativity, the Electron Theory, and Gravitation, By E. Cunningham, M.A., 

 Fellow and Lecturer of St. John's College, Cambridge. Second Edition. 

 London : Longmans, Green & Co., 39 Paternoster Row, E.C., 1921. 

 (Pp. vii + 148.) Price los, 6d. net. 



A Brief Account of Radio-Activity. By Francis P. Venable, Ph.D., D.Sc, 

 LL.D., Professor of Chemistry, University of North Carolina. New York : 

 D. C. Heath ; London : George G. Harrap & Co. (Pp. vi -H 54.) Price 

 3s. 6dZ. net. 



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