■^ iü 5P IS wfe "^ 



W K te Ä «ft- 

 THE 



JOURNAL 



OF THE 



COLLEGE OE SCIENCE, 



IMPERIAL UNIVERSITY OF TOKYO, 



Vol. XXV. 



m M ^- © ::^ ^ PP ^f 



PUBLISHED BY THE UNIVERSITY 



TOKYO, JAPAN. 



1908. 



MEIJI XLI. 



