Mat 14, 1920] 



SCIENCE 



481 



proTal and cooperation to the plan by sending 

 their names to the secretary, Mr. B. M. 

 Headicar, librarian of the London School of 

 Economics (University of London), Clare 

 Market, London, W.C. 



PUBLICATIONS FOR EUROPEAN NATIONS 



Owing to the depreciated currency of 

 Europe and the financial diiEculties in which 

 many European nations find themselves, the 

 publication of some European serials has 

 been temporarily discontinued, others have 

 decreased in size, while the publication of 

 still others is irregular. Furthermore, the 

 purchase of American books at the present 

 rat« of exchange is practically impossible. 



Since it is essential for the intellectual life 

 of mankind, that students of all countries 

 should be in close touch, and since it seems 

 of importance to America that the results of 

 our intellectual activities should be known, the 

 undersigned urge all publishers, publishing 

 institutions and publishing societies to ex- 

 change their publications on the most liberal 

 terms with libraries, publishers, journals and 

 publishing institutions and societies of all 

 European countries, disregarding for the near 

 future the question whether the amount of 

 printed matter received in exchange corre- 

 sponds with the amount sent. 



(Signed) Felix Adler, 



James E. Angell, Franz Boas, Charles W. 

 Eliot, J. Cardinal Gibbons, Arthur T. Hadley, 

 David Starr Jordan, Harry Pratt Judson, 



E. H. Lewinski-Corwin, A. Lawrence Lowell, 

 John Bassett Moore, Henry Fairfield Osborn, 

 George Foster Peabody, M. I. Pupin, Jacob 

 Gould Schurman, Ellery Sedgwick, F. J. V. 

 Skiff, Munroe Smith, Antonio Stella, Henry 

 Suzzallo, Harlan F. Stone, William H. Taft, 



F. A. Vanderlip. 



TABLES OF THE MOTION OF THE MOON 



' The " Tables of the Motion of the Moon," 

 by Ernest W. Brown, Sc.D., professor of mathe- 

 matics in Tale University, has now been pub- 

 lished through the Yale University Press. It 

 is the result of thirty years of research and 

 preparation. 



The firsit tables of the moon, founded on the 



law of gravitation, were published by Clairaut 

 in 1752, but the tables published in 1857 by 

 Hansen were the first which permitted the 

 position of the moon to be computed from 

 theory with an accuracy comparable with that 

 of observation. The only other set of like im- 

 portance is the tables foimded on Delaunay's 

 ■theory, appearing in 1911 under the final di- 

 rection of Eadau. These have been used for 

 the ephemerides of the moon since their publi- 

 ca/tion. The appearance of Professor Brown's 

 tables is expected fto constitute a new epoch in 

 -the history of astronomical tables, and to exer- 

 cise a marked effect on navigation. 



Professor Brown, a graduate of Christ's Col- 

 lege, Cambridge, has held the chair of mathe- 

 matics at Yale University since 1907, having 

 previously been professor at Haverford College. 

 He is 'the author of " Treatise on the Lunar 

 Theory," 1896; " A New Theory of the Moon's 

 Motion," 1897 to 1905 ; and of many papers on 

 the lunar theory and on celestial and general 

 mechanics. He received the gold medal of the 

 Eoyai Astronomical Society in 1907, and the 

 Royal Medal in 1914. The latest honor which 

 has come to him is the Bruce medal of the As- 

 tronomical Socieity of the Pacific, which he re- 

 cently went to San Francisco to accept. 



Professor Brown is a fellow of the Royal 

 Society and of the Royal Astronomical Society, 

 a member of the London Mathematical So- 

 ciety, the Cambridge Philosophical Society, the 

 A m erican Philosophical Society, the American 

 Mathematical Society, of which he was presi- 

 dent from 1914 to 1916, the American Asso- 

 ciation for the Advancement of Science, being 

 vioe-presidenit of Section A in 1910, and the 

 American Academy of Arts and Sciences. 



The work of Professor Brown has been 

 printed in three parts, bound in pa.i>er covers 

 in order that the various purchasers of the 

 tables may bind them to suit their individual 

 needs. The book has been printed on hand- 

 made paper, by the Cambridge University Press 

 in Cambridge, the isize of the page being lOi 

 by 131 inches. Ln- concluding his preface to 

 the " Tables of the Motion of the Moon " Pro- 

 fessor Brown has made the following state- 

 ment: 



