^ 'S? ^ ^ # ^?-2 ^ 



a ÎC ^ nt » 



JOURNAL 



OF 'IHK 



COLLEGE OE SCIENCE, 



IMPERIAL UNIVERSITY OF TOKYO, 



YOL. XXTI. 



^ M -Tîî- |S^ ::^ ^^ PP ^f 

 PUBLISHED BY THE UNIVERSITY. 



TOKYO, JAPAN. 



1906. 



MEIJI XXXIX. 



