CONGRESS OF 

 ARTS AND SCIENCE 



UNIVERSAL EXPOSITION, ST. LOUIS, 1904 



EDITED BY 



HOWAKD J. KOGERS, A.M., LL.D. 



DIRECTOR OF CONGRESSES 



VOLUME IV 



PHYSICS 

 CHEMISTRY 

 ASTRONOMY 

 SCIENCES OF THE EARTH 



BOSTON AND NEW YORK 

 HOUGHTON, MIFFLIN AND COMPANY 



1906 



