7 oo SCIENCE PROGRESS 



side issues, the planet Eros, New Stars, Moving Clusters, Star Drifts and the 

 absorption of light in space are all passed in review. Prof. Turner has produced a 

 book which will certainly arouse interest in the important undertaking to which he 

 has himself contributed so ably. £ 



Outlines of the Theory of Electro-Magnetism. A Series of Lectures delivered 

 before the Calcutta University by G. T. Walker, M.A., Sc.D., F.R.S. 

 [Pp. 52.] (Cambridge University Press, 1910.) 



THESE lectures were primarily intended to be of use to the lecturers in the outlying 

 colleges and also to the more advanced students in Calcutta. 



After a brief outline has been given of the methods of vector analysis, these are 

 applied to various fundamental problems of magnetostatics and the electro-magnetic 

 field from the Maxwell-Hertz point of view ; the electron theory of Lorentz, both 

 for fixed and moving media, is then developed by the same methods. The matter 

 is necessarily highly condensed. There are one or two obvious slips, e.g. " Lemma 1 " 

 on p. 15 should read " Lemma 2," and " Z, - Z 2 " on p. 21 should read " X, - X 2 .'> 

 On p. 34 the forces between two electric charges or between two poles are given as 



Kj*L a nd f^- instead of -^ and^- respectively, a very regrettable fundamental 



r' r~ Kr fir- 



error. G. W. O. Howe. 



Physical and Chemical Constants and some Mathematical Functions. By 

 G. W. C. Kaye, B.A. (Cantab.), D.Sc. (Lond.) and T. H. Laby, B.A. 

 (Cantab.) [Pp. vi + 153.] (Longmans, Green & Co. Price 4s. 6d. net.) 



This book should satisfy a want that has long been felt for a set of Physical and 

 Chemical Tables, in English, of convenient size and moderate price— something to 

 be possessed, not consulted in a library. Opinions will always differ with regard 

 to what should be selected from the ever-accumulating mass of physical and 

 chemical numerical data for incorporation in a volume of this size. The data have 

 been selected mainly with a view to their practical importance, though much has 

 been included on account of its scientific interest rather than its utility. The 

 chemistry section has received relatively somewhat scanty treatment, space being 

 sometimes unnecessarily wasted in this section. For instance, formula weights 

 might well have been omitted when formulae and atomic weights are given. Nearly 

 two pages are devoted to a table of factors for gravimetric analysis the only use of 

 which is the saving of a little simple arithmetic. With one or two minor excep- 

 tions, however, the data have been most judiciously selected and well arranged. 

 The authors have also dipped into such parts of astronomy, engineering and geology 

 as border on physics and chemistry and have given considerable prominence to 

 radioactivity and gaseous ionisation. 



There is little doubt that the book will meet with a large demand. It is useful, 

 trustworthy, up-to-date and inexpensive. yj 



Further Eesearches into Induced Cell-reproduction and Cancer. By H. C. 

 Ross, J. W. Cropper, and E. H. Ross. (London : John Murray, 191 1.) 



Mr. ROSS has published a continuation of his investigations on cell-repro- 

 duction and cancer. He has extended the methods he has described previously, 

 involving the use of " coefficient jelly," " auxetics " and " kinetics." We cannot 



