/37 V/ 



m ^ 



^ ^ê ^ 



T H E 



JOURNAL 



OF THE 



COLLECIE OF SCIENCE, 



IMPERIAL UNIVERSITY OF TOKYO. 



Vol. XXX. 



:^ M ^ ® -A ^ PP ft 



nip. Ll SHED BY THE ITNIVERSITY. 



TOKYO, JAPAN, 



1911-1912. 



MEIJI XLIV— XLV. 



