Vol. VI 



DECEMBER, 1911 



No. 6 



THE PHILIPPINE 



JOURNAL OF SCIENCE 



EDITED BY 



PAUL C. FREER, M. D., Ph. D. 



WITH THE COOPERATION OF 



W. D. SMITH, Ph. D.; ALVIN J. COX, Ph. D.; H. D. GIBBS, B. S. 

 W. C. REIBLING, B. S.; NELLIE LOUISE COOK, B. L., M. A. 



PUBLISHED BY 



THE BUREAU OF SCIENCE 



OF THE 



GOVERNMENT OF THE PHILIPPINE ISLANDS 



A. Chemical and Geological Sciences and 

 THE Industries 



MANILA 



BUREAU OF PRINTING 



1911 



WAV laHi. 



