90 THE BUREAU OF SCIENCE 



publications; and several reports of commissions, series of gov- 

 ernment publications, etc. have been secured without cost. 



Circnlatio7i. — The circulation of the library has increased 

 steadily. All bound volumes out of the library were recharged 

 once during the year, and single numbers of serials were checked 

 three times. Calling in numbers to complete volumes for binding 

 serves as a check against loss of single numbers, but it would 

 be more satisfactory if the staff were sufficiently large to enable 

 us to call in single numbers for renewal or discharge monthly 

 and bound volumes at least twice a year. The total number 

 of volumes charged during the year was 20,264, an average 

 of 55.5 per day, including holidays and Sundays. The average 

 per day for the fiscal year 1912 was 23. The total number 

 of books out of the library on June 30, 1913, was 5,600. Many 

 of these have been charged out since September, 1912, the time 

 at which the recharging of all books out of the library was 

 completed. No time limit has been placed on the circulation, 

 and many of the above volumes are kept out practically all the 

 time as deposits. 



Use. — The use of the library has increased since the extension 

 of the hours during which it is open and with more general 

 information as to its resources. The recently completed installa- 

 tion of the lights in the stacks facilitates our work, and we 

 are in a position to give a greater degree of publicity in regard 

 to the library than we have heretofore found possible. There 

 should be much greater growth during the next year. The 

 tables will accommodate comfortably from twenty-five to thirty 

 readers, and there is space in the reading room for another 

 table to accommodate ten or twelve. 



ENGINEERING DIVISION 



There have been no changes in the direct supervision of the 

 power plant or the responsible employees during the year, Mr. 

 Jose Guerrero y Reyes remaining as chief engineer and Mr. F. 

 R. Ycasiano as assistant engineer. Many of the subordinate 

 employees have resigned and have been replaced by others. 



The extension of the boiler room in front of the furnaces made 

 possible the elongation of the fire box of, or more exactly the 

 addition of a Dutch-oven furnace to, the new boiler and a con- 

 venient arrangement of auxiliary machinery and pumps in front 

 of the boiler room, where there is good light, less dust, and 

 better ventilation, conditions that help to reduce the depreciation 

 of machinery. 



Poiver plant. — This is the central power plant for the Philip- 



