CONTENTS 



No. 1, February, 1914 



Page. 

 Cox, Alvin J., and Arguelles, A. S. The soils of the Island of 



Luzon 1 



Seven plates, 3 text figures, and 1 map. 



Wright, J. R., and Smith, 0. F. A quantitative determination of 

 the radium emanation in the atmosphere and its variation with 

 altitude and meteorological conditions 51 



One text figure. 



West, Augustus P., and Cox, Alvin J. Burning tests of Philippine 



Portland cement raw materials 79 



One plate and 3 text figures. 



No. 2, April, 1914 



Pratt, David S., and Brill, Harvey C. The absorption spectra of 



various phthalides and related compounds, II 105 



Six text figures. 



Reibling, W. C, and Reyes, F. D. The efficiency of Portland cement 



raw materials from Naga, Cebu 127 



Two plates. 



Pratt, Wallace E. Geology and field relations of Portland cement 



raw materials at Naga, Cebu 151 



Ci.^ rKte and 3 text figures. 



Reibling, W. C. Natural cement versus brick; Iwahig penal colony 



raw materials 163 



One plate. 



Pratt, David S. The coconut and its products, with special reference 



to Ceylon 177 



Five plates. 



No. 3, June, 1914 



Dalburg, F. a., and Pratt, Wallace E. The iron ores of Bulacan 



Province, P. 1 201 



Six plates, 6 text figures, and 1 map. 



Eddingfield, F. T. Microscopic study of the Bulacan iron ores 263 



Editorial: Notes on the geology of Port Arthur and vicinity 269 



Reviews 271 



No. 4, July, 1914 



Cox, Alvin J., Heise, George W., and Gana, V. Q. Water supplies 



in the Philippine Islands 273 



Five plates. 



iii 



