Miscellaneous Intelligence. 365 



preceded it than if facility has to be acquired while the attention 

 is fixed on another new and quite different kind of manipulation. 

 The graphic method is freely used in this book. Though it 

 contains a minimum of purely theoretical matter, it is more schol- 

 arly than most, and harder, therefore, for the average student. 



w. B. 



6. Who's Who in Science, International, 191J/.; edited by 

 H. H. Stephenson. Pp. xx, 662. New York (The Macmillan 

 Company). — The third issue of this most useful work shows a 

 natural growth over its predecessor, numbering one hundred 

 additional pages. Although anything approaching a complete 

 list of the world's scientists would be hopelessly long, this classi- 

 fied index containing 9,000 entries is large enough to include 

 those about whom it is most important to gain information. 

 It may be noted that while the book is published in English and 

 printed in Great Britain, the British element constitutes less than 

 a quarter of the whole. In general, the lines laid down in the 

 volume for 1913 are followed in the one now in hand. The open- 

 ing pages contain an obituary for 1913, and following this a list 

 of the universities of the world (pp. 1-52) and the scientific 

 societies (pp. 53-11*7). The biographies cover five hundred pages 

 and a classified index (pp. 622-662) shows at once what names 

 are included from the different countries in each department. 



7. Franklin Institute award of the Elliott Cresson Medal. — 

 The Franklin Institute of Philadelphia has awarded the Elliott 

 Cresson gold medal to Professor Wolfgang Gaede for his molecu- 

 lar air pump, in consideration of the very great value of this 

 invention for the quick production of vacua beyond those hitherto 

 obtainable. This pump depends for its action on the dragging 

 of a gas by a rapidly moving surface. It consists essentially of a 

 cylinder in which revolves a rotor. The peripheries of the cylin- 

 der and rotor are so formed that annular projections in the former 

 very nearly fit into annular recesses in the latter. The rotor is 

 revolved at from 8000 to 12000 revolutions per minute, and drags 

 the gases to be exhausted with it past the stationary surface of 

 the cylinder. The pump produces a vacuum of -000001 mm in 4 

 minutes. 



8. The Cambridge Manuals of Science and literature. New 

 York, 1913 (G. P. Putnam's Sons). — The following little books 

 in the series (12mo) have been received : 



The Wanderings of Animals ; by Hans Gadow. Pp. viii, 150 ; 

 17 maps. 



The Theory of Money ; by D. A. Barker. Pp. vii, 141. 

 Copartnership in Industry ; by C. R. Fat. Pp. 146. 



9. Tables and other Data for Eyigineers and Business Men y 

 compiled by Charles E. Ferris. Eighteenth edition. Pp. 244. 

 Knoxville, Tenn. (University Press. Price 50 cents). — This new 

 edition of the Manual for Engineers (see vol. xxviii, p. 566) has 

 been extensively revised. In addition to the engineering tables, 

 attention is given to instructions to be followed in case of electric 

 shock, shop injuries, antidotes for poison, etc., information 

 especially valuable to the active engineer. 



