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noiP. 



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. ; R. R. WILLIAMS, M. S. ; D. S. PRATT, Ph. D. 

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



RICHARD c. McGregor, a. B. ; H. E. KUPFER, Ph. b. 



Volume X 



1915 



With 30 Plates and 40 Text Figures 



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Id' 



293&5B 



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186791 



MANILA 



BUREAU OF PRINTING 



1915 



