THE 



KANSAS UNIVERSITY 

 SCIENCE BULLETIN. 



Vol. XIII, Xo. 11— July, 1922. 



COXTEXTS: 



A R.\ixF.\LL Period Eqiwl to Oxe-nixtii the Sun-spot Period, 



Dinsmore Alter. 



PUBLISHED BY THE UXIVERSITY, 

 LAWRENCE, KAN. 



Entered at the post office in Lawrence as second-class matter. 

 9-3728 



