NU 
A 
T 
E 
HY 
ARTHUR L HUGHES 
Professor of Physics 
WASHINGTON UNIVERSITY 
Saint Louis 
Transactions of the 
ACADEMY OF SCIENCE 
of 
Saint Louis 
4642 Lindell Blvd. 
St. Louis 8, Mo 
VOLUME XXXI 
NUMBER 5 
Issued April 30. 1950 
Price 50c 
