è<r^' 



1^ IC Sê «• 



THE 



JOURNAL 



OF THE 



COLLEGE OF SCIENCE, 



IMPERIAL UNIVERSITY OF TOKYO, 



VOL. XX. 



m M ^ 19 :;^ ^ W It 

 published by the university. 



t5ky5, japan. 



1904—1905. 

 MEIJI XXXVII.— xxxviir. 



