SCIENCE 



A WEEKLY JOURNAL DEVOTED TO THE ADVANCEMENT OF SCIENCE, PUBLISHING THE 



OFFICIAL NOTICES AND PROCEEDINGS OF THE AMERICAN ASSOCIATION 



FOR THE ADVANCEMENT OF SCIENCE. 



FRroAY, September 22, 1905. 



CO'NTE'NTS. 

 The Progress of Physics in the 'Nineteenth 

 Century, I : Peofessor Carl Barus 353 



Scientific Books : — 



de Vries's Species and Varieties: Pro- 

 fessor Chas. B. Da-\tenpoet. Nernsfs 

 Theoretical Chemistry: Professor Harry 

 C. Jones 369 



Scientific Journals and Articles 373 



Special Articles: — 



Skull and Skeleton of Sauropodous Dino- 

 saurs, Morosaurus and Brontosaurus : H. F. 

 0. The Drumming of the Drum-fishes: 

 Dr. Hugh M. Smith 374 



Peter Artedi: Dr. Charles R. Eastman. . . . 378 



Declaration of the National Educational 

 Association at the Asbury Park Meeting.. 379 



Sciejitific Notes and News : 380 



University and Educational News 384 



MSS. inteuded for publicatiou aud books, etc., intended 

 for review should be sent to the Editor of Science, Garri- 

 son-on-Hudson, N. Y. 



TUE PROGRESS OF PHYSICS IN THE NINE- 

 TEENTH CENTURY.^ 



I. 



Mr. President, Ladies and Gentlemen: 

 You have honored me by requesting at my 

 hands an account of the advances made in 

 physics during the nineteenth century. I 



^ Paper read at the International Congress in 

 St. Louis. 



have endeavored, in so far as I have been 

 able, to meet the grave responsibilities im- 

 plied in your invitation ; yet had I but 

 thought of the overwhelmingly vast terri- 

 tory to be surveyed, I well might have hesi- 

 tated to embark on so hazardous an under- 

 taking. To mention merely the names of 

 men whose efforts are linked with splendid 

 accomplishments in the history of modern 

 physics would far exceed the time allotted 

 to this address. To bear solely on certain 

 subjects, those for instance with which I 

 am more familiar, would be to develop an 

 unsymmetrical picture. As this is to be 

 avoided, it will be necessary to present a 

 straightforward compilation of all work 

 above a certain somewhat vague and arbi- 

 trary lower limit of importance. Physics 

 is, as a rule, making vigorous though par- 

 tial progress along independent parallel 

 lines of investigation, a discrimination be- 

 tween which is not possible until some cata- 

 clysm in the history of thought ushers in a 

 new era. It will be essential to abstain 

 from entering into either explanation or 

 criticism and to assume that all present are 

 familiar with the details of the subjects to 

 be treated. I can neither popularize nor 

 can I endeavor to entertain, except in so 

 far as a rapid review of the glorious con- 

 quests of the century may be stimulating. 

 In spite of all this simplicity of aim, 

 there is bound to be distortion. In any 

 brief ■ account, the men working at the be- 

 ginning of the century, when investigations 

 were few and the principles evolved neces- 

 sarily fundamental, will be given greater 

 consideration than ecpially able end abler 



