^ ^ IS ^ -P ,f 5 



■i- & » 



THE 



JOURNAL 



OF THE 



COLLEGE OE SCIENCE, 



IMPERIAL UNIVERSITY OF TOKYO, 



VOL. XIII. 



M -^^ -^ m i^ ^ ^\i 'ii 

 PUBLISHED BY THE UNIVEPtiSlTY. 



TOKYO, JAPAN. 



1900—1901. 



MEIJl XXXIII — XXXIV. 



