628 



SCIENCE 



[Vol. LVI, No. 1457 



MeducUon of singularities &f ylane curves by 

 hirational transformation: Professor G. A. 

 Bliss, University of Chicago, retiring president 

 of the societj'. 



The grafting of the theory of limits on the 

 calculus of Leibniz: Peofessor PLOEiiN Cajori, 

 TJniversity of California, representing the asso- 

 ciation. 



Geometry and physics: Professor Oswald 

 Veblen, Princeton University, retiring vice- 

 president of Section A of the American Associa- 

 tion. 



At the Friday morning session the folow- 

 ing papere -wiil he given: 



Period of the bifilar pendulum for finite ampli- 

 tudes: Professor H. S. Uhler, Yale University. 



SJcew squares: Professor "W. H. Echols, Uni- 

 versity of Virginia. 



On the averaging of grades: Professor C. F. 

 GuMMER, Queen 's University. 



Mathematics at Oxford and the Ph.D. degree: 

 Professor W. R. Bubwell, Brown University. 



Some unsolved problems in the theory of 

 sampling: Professor B. H. Camp, Wesleyan Uni- 

 versity. 



Some unsolved problems in solid geometry: 

 Professor J. L. Coolidge, Harvard University. 



It is of special note that the session on 

 Friday afternoon will be devoited to a "Sympo- 

 siium on Mathemajtieal Statisties," for the pur- 

 pose of strengtheniag the existing entente cor- 

 diale between mathematicians «n the one hand 

 and practicing statisticians on the other. It is 

 hoped that this symposium wUl be of real 

 service, not only to those who are giving courses 

 in Sitatisties in departments of mathematics, 

 but also to others who may be interested in the 

 application of mathematics to statistical prob- 

 lems. The following papers will be read : 



The subject matter of a course in mathematical 

 statistics: Professor H. L. Eietz, head of the 

 department of mathematics at the State Univer- 

 sity of Iowa, and chairman of the National Re- 

 search Council's Committee on the Mathematical 

 Analysis of Statistics. 



Time series of economic statistics: their fluc- 

 tuation and correlation: Warren M. Persons, 

 professor of economics at Harvard University, 

 and editor of the Review of Economic Statistics, 

 published by the Harvard Committee on Eco- 

 niomic Research. 



The fundamental concepts of the calculus of 

 mass variation: Arne Fisher, statistician of tho 

 American Telephone and Telegraph Company, and 



author of ' ' The mathematical theory of proba- 

 bilities and its application to frequency curves 

 and statistical methods. ' ' The discussion will be 

 opened by Raymond Pearl, professor of biome- 

 try and vital statistics in the School of Hygiene 

 and Public Health, Johns Hopkins University, 

 and statistician of the Johns Hopkins Hospital. 



CHEMISTRY AT THE BOSTON MEETING OF 

 THE AMERICAN ASSOCIATION 



The Boston meeting of the American Asso- 

 'ciation for the Advancement of Science will 

 undoubtedly be the most important to chemists 

 of any of its meetings held for years. Papers 

 on research work completed or in progress are 

 now imvLted from the chemists of the country. 

 In addition to such papers as may ibe sub- 

 mitted there will be a symposium on "The 

 Progress of Chemistry," and a second sym- 

 posium on "Photochemistry and Plant Physi- 

 ology," in which 'the leading chemists of the 

 country will discuss these subjects. In ad- 

 dition the American Physical Society will con- 

 tinue the series of sym.posia ibegun last year 

 jointly with 'the Mathematiea and Chemical 

 Societies. The subject will be "Ionization 

 Potentials and Atomic Radiaition," and the 

 speakers will be Paul D. Foote, K. T. Comp- 

 ton and Henry Norris Russell. 



The following list gives the papers already 

 arranged for in connection with the symposium 

 on the progress of chemistry: "Compres- 

 sibilities and the size of atoms," by Theodore 

 W. Richards, of Harvard University; "Pro- 

 teins and the theory of colloidal behavior," 

 Jacques Loeb, of the Rcyekefeller Institute; 

 "X-rays as related to the structure of atoms 

 and of crystals," William Duane and also 

 (reorge L. Clark, both of Harvard University; 

 "Changes in volume during the solution of 

 solids," Gi-egoi-y P. Baxter, of Haiward Uni- 

 versity; "The chemistry of the photographic 

 process," C. E. K. Mees, of the Eastman Kodak 

 Company; "The present status of the theory 

 of 'Oomptete ionization," D. A. Maelnnes, of 

 the Massachusetts Institute of Technology; 

 "The present status of the theory of incomplete 

 ionizaion," James Kendall, of Columbia Uni- 

 versity; "Ionization potentials and chemical 

 action," W. A. Noyes, Jr., and "The separation 



