36 The Philippine Journal of Science 



Page. 



Pratt, W. E. The mechanical analysis of soil , 35 



One text figure. 



Williams, R. R. The economic possibilities of the mangrove swamps 



of the Philippines 45 



No. 2, April, 1911 



tissued July 17, 1911.] 



Pratt, W. E. The eruption of Taal Volcano, January 30, 1911 63 



Fourteen plates and 3 text figures. 



Martin, C. Observations on the recent eruption of Taal Volcano.... 87 



Seven plates. 



Cox, A. J. The composition of the fine ejecta and a fev? other inor- 

 ganic factors of Taal Volcano 93 



GiBBS, H. D. The alcohol industry of the Philippine Islands, part I: 

 A study of some palms of commercial importance with special 



reference to the saps and their uses 99 



Eight plates, 1 map, and 3 text figures. 



No. 3, June, 1911 

 [Issued July 25, 1911.] 



GiBBS, H. D. The alcohol industry of the Philippine Islands, part 



I (concluded) 147 



Twenty plates, 2 maps, and 3 text figures. 



Reibling, W. C, and Reyes, F. D. Physical and chemical properties 



of Portland cement, part III 207 



One plate and 7 text figures (diagrams). 



Holmes, W. C. On the formation of certain, alkaloidal periodides — 



Preliminary investigation 253 



Three text figures (diagrams). 



No. 4, August, 1911 



[Issued November 15, 1911.] 



Cox, A. J. Philippine soils and some of the factors which influence 



them _ 279 



Eleven plates and 10 text figures. 



Herrmann, R. A theory on the formation of the central Luzon 



plain 331 



Brooks, B. T. New Philippine essential oils 333 



Two plates. 



Editorial: The fluctuation in the value of ylang-ylang oil and some 



of its causes, by B. T. Brooks _ 355 



No. 5, October, 1911 



[Issued March 28. 1912.] 



Smith, W. D. Geological reconnaissance of Mindanao and Sulu, 



III: General and economic geology 359 



Five plates, 1 colored map, and 1 text figure (map). 



Ferguson, H. G. The geology and mineral resources of the Aroroy 



district, Masbate _ 397 



Three plates and 2 maps (1 colored). 



Reviews 427 



