

CONTENTS 



Pago. 



PRATT, DAVID S., and BRILL, HARVEY C. The Absorption 



Spectra of Various Phthalides and Related Compounds, II 105 



REIBLING, W. C, and REYES, F. D. The Efficiency of Portland 



Cement Raw Materials from Naga, Cebu : 127 



PRATT, WALLACE E. Geology and Field Relations of Portland 



Cement Raw Materials at Naga, Cebu 151 



REIBLING, W. C. Natural Cement versus Brick; Iwahig Penal 



Colony Raw Materials ^ 163 



PRATT, DAVID S. The Coconut and its Products, with Special 



Reference to Ceylon 177 



u. s. 



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