r 





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 THE 



JOURNAL 



OF THE 



COLLEGE OE SCIENCE, 



IMPERIAL UNIVERSITY OF TOKYO, 



J^APAN. 



VOL. XXVIIÎ. 



m M -^ S :^ ^ fP It 



PUBLISHED BY THE UNIVEESITY. 

 TOKYO, JAPAN. 



1910-19n. ^^g^jj 



MEIJl XLIll-XLIV. 



