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 



W. E. PRATT, A. M. ; H. C. BRILL, Ph. D. ; J. R. WRIGHT, Ph. D. ; 



G. W. HEISE, M. S.; J. C. WITT, Ph. D.; T. DAR JUAN, A. B.; 



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



Volume XI 



191G 



« 

 With 5 Plates and 13 Text Figures 



6 0^^^/u 



145113 



MANILA 

 BUREAU OF PRINTING 



1917 



