^ "^ '^ M ^ 



m. ^ ^ ^Ä 



IR P3 fe K # 



THE 



JOURNAL 



OF THE 



COLLEGE OE SCIENCE, 



IMPERIAL UNIVERSITY OF TOKYO. 



Vol. XLII. 



PUBLISHED BY THE UNIVERSITY. 



TOKYO, JAPAN. 



1919—1921 



TAISHO 8-10. 



