THE PHILIPPINE 
JOURNAL OF SCIENCE 
PAuinCs HREM eai)s: (Pre sD: 
SUCCEEDED BY 
ALVIN de COMeM A: PH. DD: 
GENERAL EDITOR 
WITH THE COOPERATION OF 
W. D. SMITH, Pu. D.; H. D. GIBBS, B. 58. 
W. C. REIBLING, CH. E.; W. E. PRATT, A. M. 
RICHARD C. McGREGOR, A. B. 
PUBLISHED BY 
THE BUREAU OF SCIENCE 
OF THE 
GOVERNMENT OF THE PHILIPPINE ISLANDS 
SECTION A 
CHEMICAL AND GEOLOGICAL SCIENCES 
AND THE INDUSTRIES 
VOLUME VII 
1912 
WITH 44 PLATES, 26 TEXT FIGURES, AND 2 MAPS 
MANILA 
BUREAU GF PRINTING 
1912 
227884 
