62 The Philippine Journal of Science 



Page. 



Blackwood, O. H. A determination of the diurnal variation of the 

 radioactivity of the atmosphere at Manila by the active deposit 

 method 37 



Five text figures. 



GiBBS, H. D., and Brill, H. C. Diethylsuccinosuccinate (ethyldioxy- 

 dihydroteraphthalate) : A study of its constitution, some deriv- 

 atives, and absorption spectra 51 



Three text figures. 



Heise, G. W. Water supply for the city of Iloilo 65 



One text figure. 



Heise, G. W. Boiler waters of Iloilo Province 75 



Smith, W. D., Eddingfield, F. T., and Fanning, P. R. A prelimi- 

 nary check list of Philippine minerals 81 



Reviews ;.... 97 



No. 2, March, 1915 



[Issued August 28, 1915.] 



GiBBS, H. D. Proposed modification of ylang-ylang oil standards.... 99 



Brill, H. C., and Agcaoili, F. Philippine oil-bearing seeds and their 



properties, II :... 105 



Two text figures. 



Brill, H. C. The enzymes of cacao 123 



Heise, G. W. Water supplies in the Philippine Islands, II 135 



Reviews '. 171 



No. 3, May, 1915 

 [Issued September 18, 1915.] 



Smith, W. D. Notes on a geologic reconnaissance of Mountain Prov- 

 ince, Luzon, P. I _ 177 



Five plates and 5 text figures. 



Smith, W. D. Notes on the geology of Panay 211 



One plate and 3 text figures. 



No. 4, July, 1915 



[Issued September 24, 1915.] 



Pratt, W. E. ' The location of artesian wells in the Philippine 



Islands from a geologic viewpoint 231 



Pratt, W. E. Petroleum and residual bitumens in Leyte 241 



One plate and 2 text figures. 



Pratt, W. E. On the occurrence of petroleum in the Province of 



Cebu 281 



Two text figures. 



No. 5, September, 1915 



[Issued October 4, 1915.] 



Pratt, W. E. The persistence of Philippine coal beds 289 



Three text figures. 



Pratt, W. E. Geologic reconnaissance in Caramoan Peninsula, Ca- 



marines Province 303 



One plate and 2 text figures. 



