SCIENCE 



Friday, March 12, 1920 



CONTENTS 



Einstein's Law of Gravitation: Professor J. 

 S. Ames 253 



Learned Societies, Old and Nexo: Dr. P. A. 

 Levene 261 



A Bust of the Late Professor E. D. Cope ; Dr. 

 Philip P. Calvert 264 



Scientiflo Events: — 



The Henry Fhipps Institute; The Award of 

 the Boyle Medal; In Honor of William H. 

 Welch 265 



Scientific Notes and Nexos 267 



University and Educational Neivs 270 



Discussion and Correspondence: — 



An Odd Problem in Mechanics : Ds. Walter 

 D. Lambert 271 



Quotations: — 

 Federations of Brain Worlcers 272 



Scientific Books : — 

 The Productivity of Invertebrate Fish Food 

 on the Bottom of Oneida Lake: Professor 

 Chancet Judat 273 



Special Articles: — 



The Antiscorbutic Property of Dehydrated 

 Meat: Drs. Maurice H. Givens and Harry 

 B. McClugage 273 



The American Meteorological Society: De. 

 Charles P. Brooks 275 



MSS. intended for publication and books, etc., i ntended for 

 review should be sent to The Editor of Science, Ga 

 Hudson, N. Y. 



EINSTEIN'S LAW OF GRAVITATION^ 



The by-laws of our society make it one of 

 the duties of its president to deliver an ad- 

 dress before its members. This fact renders 

 it necessary for the president to select a siib- 

 ject; and this year the selection is to a 

 certain degree forced by the public press. 

 When a daily newspaper considers Einstein's 

 work on gravitation a topic of sufficiently 

 general interest to devote to it valuable space 

 and cable funds, surely here is justification 

 for my selection of this as the subject of my 

 presidential addi-ess. 



Einstein's original memoirs upon gravita- 

 tion appeared in the years 1916 to 1918; and 

 there are two excellent papers in English ex- 

 pounding and explaining his method, one by 

 Professor deSitter, of Leyden, and one by 

 Professor Eddington, of Cambridge. "While 

 Einstein's work may be known to many of 

 you either in its original form or in one of 

 the two papers mentioned, I fear that the 

 attention of most of us was first directed 

 seriously to the matter by the articles in the 

 newspapers to which I have referred. I con- 

 fess that I was one of those who had post- 

 poned any serious study of the subject, until 

 its immense importance was borne in upon 

 me by the results of the recent eclipse expedi- 

 tion. I have all the enthusiasm of the dis- 

 coverer of a new land, and feel compelled to 

 describe to you what I have learned. 



Albert Einstein, although now a resident 

 of Berlin and holder of a research professor- 

 ship of the Kaiser Wilhelm Institute, is 

 legally a Swiss. He is forty-five years old 

 and was for some time a professor in the 

 Zurich Technical School, and later in the 

 University of Prague. He is a man of liberal 

 tendencies, and apparently one whom any of 



1 Presidential address delivered at the St. Louis 

 meeting of the Physical Society, December 30, 

 1919. 



