m ^ i§ :^ -* ^.5 



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THE 



JOURNAL 



OF THE 



COLLEGE OE SCIENCE, 



IMPERIAL UNIVERSITY OF TOKYO, 

 YOL. XI r. 



m M # s :^ ^ ßP rr 



PUBLISHED BY THE UNIVERSITY. 



TOKYO, JAPAN. 



1898— 1900. 



MEIJI XXX — XXXIII. 



