i £ : r ■ r ■ 



Vol. XII, Sec. A, No. 4 



July, 1917 



THE PHILIPPINE 



JOURNAL OF SCIENCE 



ALVIN J, COX, M. A., Ph. D. 



GENERAL EDITOR 



Section A 



CHEMICAL AND GEOLOGICAL SCIENCES 

 AND THE INDUSTRIES 



EDITED WITH THE COOPERATION OF 



H. C. BRILL, Ph. D.; 4. R. WRIGHT, Ph. D.; G. W. HEISE, M. S. 



J. C. WITT, Ph. D.; T. DAR JUAN, A. B.; A. H. WELLS, A. B. 



R. C. MCGREGOR, A. B.; H. E. KUPFER, A. B. 



MANILA 

 BUREAU OP PRINTING 



1917 



