344 SCIENCE PROGRESS 



The Group Mind. A Sketch of the Principles of Collective Psychology, with 

 some attempt to apply them to the Interpretation of National Life 

 and Character. By William McDougall, F.R.S., Late Fellow of St. 

 John's College, Cambridge, Fellow of Corpus Christi College, and Wilde 

 Reader in Mental Philosophy in the University of Oxford. Cambridge : 

 at the University Press, 1920. (Pp. xvi + 304.) Price 21s. net. 



Human Efficiency and Levels of Intelligence. By Henry Herbert Goddard, 

 Director of the Bureau of Juvenile Research of Ohio. Lectures deli- 

 vered at Princeton University, April 7, 8, 10, 11, 1919. Princeton: 

 Princeton University Press ; London : Oxford University Press, 1920. 

 (Pp. 128.) Price 6s. 6d. net. 



Archimedes. By Sir Thomas Heath, K.C.B., K.C.V.O., F.R.S., Sc.D. Camb., 

 Hon. D.Sc. Oxford. Men of Science Series. Edited by S. Chapman, 

 M.A., D.Sc, F.R.S. London : Society for Promoting Christian Know- 

 ledge ; New York : The Macmillan Company, 1920. (Pp.58.) Price is. 

 net paper ; 2s. net cloth.) 



Internal Combustion Engines : Their Principles and Application to Auto- 

 mobile, Aircraft, and Marine Purposes. By Wallace L. Lind, M.S. 

 (Columbia University), Lieutenant-Commander U.S. Navy. New 

 York and London: Ginn & Company. (Pp. 225.) Price los. net. 



A Constitution for the Socialist Commonwealth of Great Britain. By Sidney 

 and Beatrice Webb. London : Longmans, Green & Co., 39 Pater- 

 noster Row, 1920. (Pp. xviii-h 364.) Price 12s. 6d. net. 



Grosses WorterbuchDeutsch-Ido. In Uebereinstimmung mit den Beschliissen 

 der Ido-Akademie, und revidiert von Kurt Feder. Paris : Imprimerie 

 Chaix, II Boulevard Saint-Michel, 1920. (Pp. xviii-f 823.) Price 

 17.50 frs. 



The Idea of Progress. An Inquiry into its Origin and Growth. By J. B. 

 Bury, Regius Professor of Modern History, and Fellow of King's College, 

 University of Cambridge. London : Macmillan & Co., 1920. (Pp. xiv -f 

 377.) Price 14s. net. 



The Idea of Progress. By W. R. Inge, C.V.O., D.D., Hon. Fellow of Hertford 

 College. Delivered in the Sheldonian Theatre, May 27, 1920. The 

 Romanes Lecture, 1920. Oxford : at the Clarendon Press, 1920. (Pp. 

 34). Price 2s. net. 



ANNOUNCEMENT 



The Second International Congress of Comparative Pathology is holding 

 its meetings in Rome during April 1921, and the Secretary-General is pre- 

 pared to receive titles and abstracts of papers dealing with Comparative 

 Pathology of Man, Animals, and Plants, provided that the communications 

 do not reach him later than December 15, 1920. Those desiring to attend 

 the Congress are requested to communicate either with M. le Prof. Mario 

 Levi della Vida, Secretaire- General du Comite d'Organisation, 58 Via 

 Palermo, Rome, or with Prof. George H. F. Nuttall, Sc.D., F.R.S., Long- 

 field, Madingley Road, Cambridge, England. 



Printed by Haxell, WaUon & Vitiey, Ld., London and Aylesbury, England. 



