1 86 SCIENCE PROGRESS 



with or without German, have been published for the use of engineers and 

 other technical workers in the field. An excellent vocabulary of this kind by 

 Mr. Philip Parker has been specially designed for the use of men who supply 

 water to the British troops. It is in the three languages and will certainly be 

 useful. 



The Minor Horrors of War. By A. E. Shipley, Sc.D., Hon. Sc. D. Princeton, 

 F.R.S., Master of Christ's College, Cambridge, and Reader in Zoology in the 

 University. Illustrated. Second Edition. London : Smith, Elder & Co. 

 15, Waterloo Place, 1915. (Pp. xi + 178.) 



The World's Cotton Crops. By John A. Todd, B.L., Professor of Economics, 

 University College, Nottingham, Formerly of the Khedivial School of Law, 

 Cairo. With Thirty-two Page Illustrations. Also sixteen Maps and Diagrams. 

 London : A. & C. Black, Ltd., 4, 5 & 6, Soho Square, W., 191 5. (Pp. xii + 

 460.) Price 10s. net. 



Discoveries and Inventions of the Twentieth Century. By Edward Cressy. 

 Profusely Illustrated. London : George Routledge & Sons, Ltd., Broadway 

 House, 68-74, Carter Lane, E.C., 1914. (Pp. xvi -f 398.) Price ys. 6d. net. 



Improved Four-Figure Logarithm Table. Multiplication and Division made 

 Easy. By George C. McLaren, Fellow of the Faculty of Actuaries, 

 Scotland. Cambridge: at the University Press, 1915. (Pp. 27.) Price 

 is. 6d. net. 



Will be very useful to many and especially applicable for teaching children 

 the use of logarithms— -a thing which ought to be taught much more frequently 

 than it is, even in elementary schools. Perhaps the preliminary explanation 

 of the tables ought to have contained a few more examples. The principle 

 adopted is to get rid of the " characteristic," and to place the decimal point by 

 means of ordinary arithmetical considerations, and we think that this principle 

 is quite justified by the results. As a matter of fact the characteristic often 

 gives more trouble than the rest of the logarithmic calculation. The remainder 

 of the logarithm after the first four figures is given by the use of a full stop for 

 a fraction of about one-third and a colon for a fraction of about two-thirds, and 

 this easily suffices for the objects of this little table— which we can strongly 

 commend. 



Combinatory Analysis. By Major Percy A. MacMahon, F.R.S., D.Sc, LL.D. 

 (late Royal Artillery), of St. John's College, Cambridge. Vol. I. Cambridge : 

 at the University Press, 191 5. (Pp. xix 4- 300.) Price 1 5.?. net. 



Symbiogenesis : The Universal Law of Progressive Evolution. By Hermann 

 Reinheimer. 191 5, Knapp, Drewett & Sons, Ltd., 30, Victoria Street, 

 Westminster, S.W., and Clarence Street, Kingston-on-Thames. (Pp. xxiii + 

 425.) Price \os. 6d. net. 



A History of Botany in the United Kingdom from the Earliest Times to the End 

 of the 19th Century. By J. Reynolds Green, Sc.D., F.R.S., Fellow and 

 Lecturer of Downing College, Cambridge. London and Toronto : J. M. 

 Dent & Sons, Ltd. ; New York : E. P. Dutton & Co., 1914. (Pp. xii + 648.) 

 Price \os. 6d. net. 



Towards Racial Health. A Handbook for Parents, Teachers and Social Workers 

 on the Training of Boys and Girls. By Norah H. March, B.Sc, M.R.San. I. 

 With a Foreword by J. Arthur Thomson, M.A., LL.D., Professor of Natural 



