IV CONTENTS. 



No. 4, July, 1910. 



XIX. Richmond, George F. Philippine Fibers and Fibrous Substances : 



Their Suitability for Paper Making 233 



XX. Bacon, Raymond F. Philippine Terpenes and Essential Oils, 



IV 257 



XXI. Bacon, Raymond F. A Preliminary Study of the Effect of 

 Tropical Sunlight on the Atmosphere, with Some Notes on 



Radioactive Phenomena in the Philippines 267 



XXII. Bacon, Raymond F. A Solution of Oxalic Acid and Uranium 



Salts as a Chemical Photometer 281 



XXIII. Reviews 305 



No. 5, November, 1910. 



XXIV. Smith, Wakken D. The Essential Features of the 'Geology of 



the Philippine Islands ....: 307 



XXV. Smith, Warren D. Geologic Reconnaissance of Mindanao and 



Sulu: II. Physiography .' '. : 345 



XXVI. Reviews .!.! : '. 365 



No. 6, December, 1910. • 



XXVII. Reibling, W. ,C, and Reyes, F. D. Physical and Chemical 



Properties of Portland Cement _ _ 367 



XXVIII. Gibbs, H. D. The Compounds which Cause the Red Coloration 

 of Aniline: II. The Effect of Sunlight in the .Absence of 

 Oxygen and Oxidizing Influences and a Comparison with the 



Behavior of Mono- and Dimethylaniline 41!) 



XXIX. Brooks, Benjamin T. The Natural Dyes and Coloring Matters 



of the Philippines 439 



XXX. Index, Title-page and Contents 453 



