CONTENTS. 



No. 1, January, 1911. 



Page. 



I. Cox, Alvin J. Philippine Firewood 1 



Plates I to X ; text figure 1. 

 II. Oechslin, K. J. Quinine Esters of Phenylarsinic Acid Derivatives.. 2^3 



III. Pratt, Wallace E. The Mechanical Analysis of Soil 36 



Text figure 1. 



IV. Williams, Robert R. The Economic Possibilities of the Mangrove 



Swamps of the Philippines - 45 



No. 2, April, 1911. 



V. Pratt, Wallace E. The Eruption of Taal Volcano, January 30, 



191 1 - 63 



Plates I to XIV ; text figures 1 to 3. 

 VI. Martin, Charles. Observations on the Recent Eruption of Taal 



Volcano - 87 



Plates I to VII. 

 VII. Cox, AxviN J. The Composition of the Fine Ejecta and a Few 



Other Inoi'ganic Factors of Taal Volcano 93 



VIII. GiBBS, H. D. The Alcohol Industry of the Philippine Islands. 



Part. I _ 99 



Plates I to VIII ; map 1 ; text figures 1 and 2. 

 No. 3, June, 1911. 



IX. Gibes, H. D. The Alcohol Industi-y of the Philippine Islands. 



Part I. (Concluded.) 147 



Plates IX to XX ; maps 2 and 3 ; text figures 3 to 5. 



X. Reibling, W. C. and Reyes, F. D. The Physical and Chemical 



Properties of Portland Cement. Part III 207 



Plate VI ; text figures 16 to 22. 



XI. Holmes, W. C. On the Formation of Certain Alkaloidal Periodides. 



Preliminary Investigation _. , 253 



Text figures 1 to 3. 



No. 4, August, 1911. 



XII. Cox, Alvin J. Philippine Soils and Some of the Factors which 



Influence Them 279 



Plates I to XI ; text figures 1 to 10. 



XIII. Herrmann, Raf. A Theory on the Formation of the Central 



Luzon Plain 331 



XIV. Brooks, Benjamin T. New Philippine Essential Oils 333 



Plates 1 and II. 



XV. Editorial. The Fluctuation in the Value of Ylang-ylang Oil and 



Some of Its Causes 355 



III 



