572 SCIENCE PROGRESS 



Handbook of Photomicrography. By H. Lloyd Hind, B.Sc, F.I.C., and 

 W. Brough Randies, B.Sc, Lecturer in Biology, Derby Technical College- 

 With 441 Plates, comprising 8 three-colour reproductions of direct colour- 

 photomicrographs and 85 half-tone reproductions of photomicrographs, and 

 71 text illustrations. London : George Routledge & Sons, Ltd., Broadway 

 House, 68-74, Carter Lane, E.C. (Pp. x + 292.) Price ys. 6d. net. 



The Deposits of the Useful Minerals and Rocks. Their Origin, Form, and 

 Content. By Prof. Dr. F. Beyschlag, Geh. Bergrat, Direktor der Kgl. 

 Geolog., Landesanstalt, Berlin ; Prof. J. H. L. Vogt an der Universitat, 

 Kristiania ; Prof. Dr. P. Krusch, Abteilungsdirigent, A. D. Kgl. Geolog., 

 Landesanstalt U. Dozent. A. D. Kgl. Bergakademie, Berlin. Translated by 

 S. J. Truscott, Associate Royal School of Mines, London. In three volumes. 

 Vol I. : Ore-Deposits in General — Magmatic Segregations — Contact- 

 Deposits — Tin Lodes — Quicksilver Lodes. With 291 Illustrations. London : 

 Macmillan & Co., Ltd., St. Martin's Street, 1914. (Pp. xxvii + 514.) Price 

 \Zs. net. 



Algebraic Invariants. By Leonard Eugene Dickson, Professor of Mathematics 

 in the University of Chicago. Mathematical Monographs. No. 14. Edited 

 by Mansfield Merriman and Robert S. Woodward. First Edition, First 

 Thousand. New York : John Wiley & Sons, Inc. London : Chapman & 

 Hall, Ltd., 1914. (Pp. x + 100.) Price 55-. 6d. net. 



Constructive Text-Book of Practical Mathematics. By Horace Wilmer Marsh, 

 Head of Department of Mathematics, School of Science and Technology, 

 Pratt Institute. Vol. iii. Technical Geometry. First Edition, First Thousand. 

 New York : John Wiley & Sons, Inc. London : Chapman & Hall, Ltd., 1914. 

 (Pp. xiv + 244.) Price 5^. bd. net. 



ANNOUNCEMENTS 



MEETINGS OF SOCIETIES 



ROYAL SOCIETY. Ordinary Meetings, 4.30 p.m., January 21, 28, February 4, 

 11, 18, 25, March 4, 11, 18, 25. 



Royal Astronomical Society. Meetings, 5 p.m., January 8, February 12. 



Royal Meteorological Society. Annual General Meeting, January 20. 



The Institution of Mechanical Engineers. General Meetings, 8 p.m., 

 January 22, March 19. Annual General Meeting, February 19. 



Chemical Society. Informal Meeting, 8 p.m., January 14. Meetings, 

 8.30 p.m., January 21, February 4, 18, March 4, 18. 



Physical Society. Meetings, 5 p.m., January 22, February 26, March 26 ; 

 8 p.m., March 12. Annual General Meeting, 8 p.m., February 12. 



Optical Society. Meetings, 8 p.m., January 20, March 11. Annual General 

 Meeting, 7.30 p.m., February 11. 



The medals of the Royal Society for this year have been awarded as follows : — 



Copley Medal . . Sir Joseph John Thomson. 



Two Royal Medals . Prof. E. W. Brown and Prof. W. J. Sollas. 



Davy Medal . . Prof. W. J. Pope. 



Rumford Medal . . Lord Rayleigh. 



Hughes Medal . . Prof. J. S. Townsend. 



Darwin Medal . . Prof. Poulton. 



fruited by Hazeil, Watson & Viney, Ld., London and Aylesbury. 



