THIRTEENTH ANNUAL REPORT 31 



spent considerable time working in the division on this and 

 other petrographic work. 



ROUTINE WORK 



During the last year and a half the regular assays for private 

 parties and for prospectors in new districts as well as cyani- 

 dization of ores have been continued. One hundred sixty-seven 

 assays, 34 bullion smeltings, and 209 placer gold weighings 

 have been performed during the past year. The ore-dressing 

 machinery already mentioned under the heading Chemical La- 

 boratory is set up and available for use in the reduction of ores 

 and rocks. Considerable time has been required in the prepa- 

 ration of an exhibit for the 1914 Philippine Exposition as well 

 as in segregating a representative collection of mineral and other 

 specimens suitable for the Panama-Pacific International Expo- 

 sition in 1915. 



Consultations with mining prospectors and operators, deter- 

 minations of mineral specimens, and examinations of various 

 classes of rocks have required a great deal of the time of the 

 staff. 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 number of placards and 

 labels for the Bureau of Science exhibit at San Francisco have 

 been made. 



As heretofore there has been a dem.and for the services of 

 the geologists in the development of local mineral resources on 

 account of the inability to secure private engineers. It has been 

 impossible to fill this demand entirely or to do as much field 

 work as usual. The following work has been carried on : A 

 general reconnaissance of northern Luzon and a geological re- 

 connaissance of Caramoan Peninsula, Camarines Province; a 

 private professional examination of the iron-ore deposit of the 

 town of Mambulao, Camarines; a study of the landslide which 

 threatens the safety of the Baguio Hospital; an inspection of 

 the various mining properties near the town of Baguio; a pri- 

 vate professional examination of certain limestone deposits in 

 Laguna Province. 



The relations of our scientists with the men interested in the 

 mining industry have continued to be cordial. The reference 

 list of Philippine mining corporations which was started some 

 time ago has been extended and nearly completed. All of the 

 data in our possession concerning the history, progress, and 

 present status of every mining corporation, together with such 

 information as we have concerning the geology of their mining 



