Vol. XVII, Article 12. 



M 3Ë if> HI 3v ^ £.5 # 



THE 



JOURNAL 



OF THE 



COLLEGE OE SCIENCE, 



IMPERIAL UNIVERSITY OF TOKYO, 



m m * h ± m pp it 



PUBLISHED BY THE UNIVERSITY. 



TOKYO, JAPAN. 



1903. 



MEIJI XXXVI. 



