"m ^ ^ ^ 



^ :^ m n 



as * ^ 'V. «i- 

 THE 



JOURNAL 



OF THE 



COLLEGE OF SCIENCE, 



IMPERIAL UNIVERSITY OF TOKYO. 

 Vol. XXXVIII. 



M -^ "^ m ± m w n 



PUBLISHED BY THE UNIVERSITY. 



TOKYO, JAPAN. 



1916-1917. 



TAISHO S-6. 



