50 



THE BUREAU OF SCIENCE 



PHOTOGRAPHY 



The record of the photographic work is as follows 



Kind of work. 



Negatives taken 



Lantern slides 



Prints, 5 by 7 inches 



Enlargements, 14 by 17 inches. 

 Transparencies, 8 by 10 inches 



1913 • 'y^^-- 1914. 



473 458 



974 j 875 



7,503 10,718 



116 262 



86 I 53 



AQUARIUM 



The aquarium of the Bureau of Science is situated in Manila 

 on Calle Gral. Luna (Palacio) within the bastion of the Real 

 Gate of the old Walled City, and the grounds have been parked 

 and are very attractive. 



The building is a substantial one-story structure of reenforced 

 concrete, and follows the outline of the old bastion, which is 

 that of an irregular pentagon. It consists of a single corridor 

 or tunnel, 57 meters (275 feet) long and 8 meters (25 feet) wide. 

 There are 27 exhibition tanks, each of which is faced with plate 

 glass 1 inch thick, set in solid iron frames 1 by 2 meters (3.25 by 

 6.5 feet), and lighted by skylights, one over each tank. The 

 backs of the tanks slope, so there are no unlighted corners, and 

 practically all the light in the corridor comes through the tanks, 

 which allows a most satisfactory view of the fishes. Louvers 

 placed above the tanks and in the opposite wall provide venti- 

 lation and render the corridor cool. Electric lights placed near 

 the skylights provide light for evening displays. There are two 

 large tanks about 12 meters (40 feet) in diameter outside of the 

 corridor — one for crocodiles and the other for large fishes, sharks, 

 or turtles, which may be seen from within the corridor and 

 present a pleasing grotto effect. 



The storage tanks are provided with a capacity of 95,000 

 liters (25,000 gallons) of water. The closed circulation system 

 is used. The water is returned to the supply tank from the 

 aquaria through sand filters by means of an electric pump, and 

 the water is used over and over again. This is the same system 

 as is used in the New York Aquarium. Each aquarium is 

 equipped so it can be supplied with fresh water and air as well 

 as salt water. A lead salt-water pipe system is used throughout 

 to prevent corrosion. 



The aquarium was opened in February during the 1914 Phil- 

 ippine Exposition. In the exhibition tanks we maintain a large 



