-■■; '.■■■. . .'•■.':■■' . 



Vol. XII, Sec. A, No. 5 



September, 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.; J. R. WRIGHT, Ph. D,; G. W. HEISE, M. 

 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 OF PRINTING 



