April, 1915. 



KNOWLEDGE. 



SCIENCE PROGRESS t 'h n = TWENTIETH CENTURY. 



A QUARTERLY JOURNAL OF SCIENTIFIC WORK AND THOUGHT. 

 Edited by SIR RONALD ROSS, K.C.B., F.R.S., N.L., D.Sc, LL.D., VI. D., F.R.C.S. 



176 Pages. Illustrated. 



APRIL. 



Some Aspects of the Atomic Theory. Prof. F. Soddy, 

 F.R.S. 



The Electrical Properties of Conductors at Very Low 

 Temperatures. Francis Hyndman, B.Sc. 



The Anthocyan Pigments. Arthi r K. Everest, M.Sc, Ph.D. 



Vertebrate Palaeontology in 1914. R. Lydekker F.R.S. 



The Prevision of Earthquakes. Charles Davison, ScD., 

 F.G.S. 



Is the Organism a Thermodynamic Mechanism P 



James Joh\stosk, D.Sc. 



5s. net. 



Notes: The British Science Guild and the Fight for 

 Science The Fools' War The Quality of the 

 German Lie A Converted Pacifist Our Unspeak- 

 able Cranks and other Notes. 



Correspondence: Elementary Logic (A. Sidgwick)— 

 Party Politics and Scientific Representation 

 i \. J. Gray, Se. retary "I he Pr .porti 



Essay-Reviews: Character and the Emotions iDR. F. 

 W. Moii. F.R.S.) -Plagiarism in Science (The Editor)— 

 Mathematical Text-books (Amateur)— Fact and 

 Fancy in Hematology ill. C. Ross). 



Reviews of Thirty-three Books on Mathematics, 

 Physics, Chemistry, Geology, Palaeontology, 

 Zoology, Botany, and Applied Sciences. Index. 



JOHN MURRAY, ALBEMARLE STREET, LONDON, W. 



Symons's Meteorological Magazine. 



Edited by HUGH ROBERT MILL, D.Sc. 



This Illustrated Magazine, founded in 1866, is devoted to the science 0. 

 Meteorology in all its branches. 



The monthly Climatologies] Table of the British Empire and the monthly 

 Rainfall Map of the Thames Valley are uniqTie features. Special attention 

 is given to Correspondence from Meteorologists and Observers. The 

 meetings of Meteorological Societies are punctually reported. All important 

 Books bearing on Meteorology are reviewed. Original Articles and 

 descriptions of New Apparatus frequently appear. Exceptional Conditions 

 of Weather in the British Isles are discussed while still remembered. 



Published on the 16th of each month. Price 4d., 

 annum post free to any part of the world. 



or 5s. per 



A Specimen Number will be sent free on application to the 

 Editor at 62, Camden Square. London, jV. W. 



Published by EDWARD STANFORD, Ltd., 12, 13, & 14, Long 

 Acre, London, VV.C. 



POPULAR ASTRONOMY. 



TWENTY=TWO VOLUMES COMPLETED. 



A Journal for Reference on Current Astronomy. 



Over 500 Pages of Reading Matter fully Illustrated in 



each Volume. 

 Containing the Latest Astronomical News. Articles on 

 Astronomical Themes. Many Pine Lngravings. Spectro= 

 scopic, Planet and Comet Notes. Star Charts every Month. 



A Valuable Journal in any General Library. 



Subscription 10 the Twenty-third Volume(ten numbers) post free to any address 

 in the United States on receipt of 3 dollars 50 cents; Canada, 3 dollars 75 c< 

 and 16s. 6d. for all other countries. Preceding volumes al same price. 



Editors: HERBERT C. WILSON, RALPH E. WILSON, and 

 CURVIN H. GINGRICH. 



GOODSELL OBSERVATORY OF CARLETON COLLEGE, 

 NORTHFIELD, MINN., U.S.A. 



WILLIAM WESLEY & SON, 28 Essex Street, Strand, London. 



MAN 



An illustrated monthly record of Anthropological 

 Science. II- per part. 10/- a year, post free anywhere. 

 CVXJ I \ I S OF 1/7,7/ rssi i 

 < irigin 11 \r... . , | ',„ Batm in 1 ritl Deed n H Plot, D an IB) - 

 Were thi Pre I ><• n i tic Eg Lib] an 01 I thi piai \ I l ipam ;e 



' and C like Objects used as A lets and in Charm Reviews Va/t'w 



NorUiern Territoi i 



.' Oerr. — The Hm 



Variations de la colom 

 p< inl de ■ ue de I' Anthropologic Zo .' 



London: The Royal Anthropological Institute, 50, Great Russell St. 



General Asent FRANCIS EDWARDS, 81!. Hiab Street. Maryleboae. London W 



n Si i.'iiiitn , Technii i] t ■ . I ■ , . . , 



Mi 



ei ts, and Ibi al! Exams. 

 SECOND-HAND AT 

 HALF PRICES. 

 New, at 25 Discount. 



Catalogues Free. State wants. Booksjesent on approval 



HOOKS BOUGHT— BEST PRICKS GIVEN, 

 W. & G. FOYLE, 121-123, Charin&CrossRoad, London, W.C 



Fourth Edition. Enlarged. Pp. xviii - 4'Jtl. with 113 

 Illustrations, including 5 Plates. Price 6s, net [postage 5d. . 



CROSS «& COLE'S 



MODERN MICROSCOPY 



A Handbooh for Beginners and Students. 



With Chapters on Special Subjects by 



C. Andrews, F.R.M.S. ; F. J. Cheshire. F.R.M.S. 



A. Earland, F.R.M.S. ; C. F. Rousselet, F.R.M.S. 



T. H. Russell. F.L.S. ; C. D. Soar. F.L.S., F.R.M.S. 



and W. Mark Webb. F.L.S. 



<! 



Mr J. /-.'. Barnard (Lecturer in Microscopy at Kin:'s I 

 i li Kn wiedgc," says: "It m i 

 confidence be recommended liie for those entering 



on any ': the microscope.*' 



BAILLIERE, TINDALL & COX, 8. Henrietta Street. Covent Garden, London. 



The Leading Journal of Science. 



SIXPENCE WEEKLY. 



Attention is directed to a few of the topical 

 articles which have appeared in NATURE 

 since the outbreak of the war: "Science 

 and the State" [October 29); "The Manu- 

 facture of Dyestuffs in Britain: a Summary 

 and an Appeal" [January 21) "Synthetic 

 Drugs in Great Britain " [January 

 "The Manufacture of Dyestuffs " February 

 111, "Chemistry and Industry" February 

 18); "The Manufacture of Dyestuffs" 

 Feb "Duty-free Alcohol for 



Scientific Purposes' [March i "Science 

 and Industry " [Ma "Periscopes' 



[March 18) "Oil of Vitriol as an Agent of 

 'Culture [March 18) "Scientific Factors 

 of Industrial Success'' March "Supplies 



of Laboratory and Optical Glass Apparatus " 

 [March 25) Any one number will be sent 

 by post on receipt of its published price, 

 plus postage. 



Office: St. Martin's Street, London, W.C. 



