40 THE BUREAU OF SCIENCE 



with the assay work from time to time. A new assay balance 

 with the greatest accuracy obtainable has been ordered and will 

 be the standard for work in the Far East. For the benefit of the 

 chemists and geologists a combination gas and gasoline muffle 

 furnace has been constructed. With the gas, coal, and gasoline 

 furnaces on hand almost any kind of assay work can be handled 

 expeditiously. 



The core samples from about 75 artesian wells were examined 

 during the year. A large number are on hand to be examined, 

 but the pressure of work along other lines has caused consider- 

 able delay in handling these samples, and we are badly behind. 

 The work of examining mineral specimens and rocks con- 

 tinues daily, and an increased interest in the rarer minerals 

 is being manifested by those who have had some experience in 

 mineralogy. About 300 mineral specimens have been examined 

 free of charge. When I returned to duty from the United States, 

 I brought with me samples of the commonest radium ores of 

 Colorado. They are on display at the Bureau of Science and 

 have been especially called to the attention of prospectors in the 

 Philippines in order that they might be on the lookout for the 

 occurrence of similar ores. 



The usual drafting necessary in the preparation of maps and 

 drawings for publication in the Philippine Journal of Science 

 has been carried on and in addition a great many placards were 

 made for the exhibit of this institution at the Northern Luzon 

 Fair. The draftsmen showed their interest in the affairs of 

 the Bureau of Science by doing a great deal of overtime work 

 in preparing models for this exhibit. 



Field icork. — The Bureau of Science has not been able to 

 keep up with the demand for mine examinations and other 

 geologic work. During the year the geologists have made pro- 

 fessional examinations of the limestone deposit near Laguna de 

 Bay, the Surigao iron-ore deposit and the neighboring gold de- 

 posit, the Leyte oil and asphalt deposit, the Lubang oil deposit, 

 the Cabu River placer deposit, the Acupan mining property, and 

 the Benguet Consolidated Company mining property. Several 

 of these examinations were paid for by private parties. A 

 geologist made several trips to Mindoro and while there made 

 geologic examinations for private parties, studied the geology 

 of the island, and investigated the occurrence of quartz sand. 

 We have had a number of demands for good quartz sand for 

 molding puiTDOses, for cleaning castings, for cement work, for 

 pottery use, and as a smelter flux. There is an abundant supply 

 of quartz sand near Puerto Galera, Mindoro, suitable for such 



