^ !^ i^ ^ X 'p ^ 



•+• j»^ 



T H E 



JOURNAL 



OF THE 



COLLEGE OF SCIENCE, 



IMPERIAL UNIVERSITY OF TOKYO, 



J A I> A N . 



VOL. XVIII. 



m M -^ gl :;^ ^ fP ^T 

 PUBLISHED BY THE UNIVEKSITY. 



TOKYO, JAPAN . 



1903-1904. 



, MEiJi xxxvr-xxxvii. 



