FIFTEENTH ANNUAL REPORT 57 



tayan, Phil. Journ. Sci., Sec. D (1910), vol. 5, No. 3, 149-151. Pearl, pearl 

 shells, and button shells of Mindanao and Sulu, Phil. Journ. Sci., Sec. D 

 (1916), vol. 11, No. 4, 245-265. 



Miscellaneous marine products of the Philippine Islands, Phil. Journ. 

 Sci., Sec. D (1911), vol. 6, No. 6, 296-305. 



PHILIPPINE BUREAU OF SCIENCE CHART 13 



MINOR MARINE PRODUCTS 



[See prints in photograph stand.] 



Sponges. — There are several valuable varieties of sponges in Philippine 

 waters. They should be cured only by experienced men. 



Tortoise shell. — Most of the Philippine catch of tortoise shell is exported. 

 A small amount is manufactured locally into small articles. The export in 

 1913 was valued at about $18,000 (?=36,000) . 



Trepang. — The annual export of trepang is worth about $65,000 

 (?130,000). Methods of drying could be improved, and the industry could 

 be increased. 



Coral. — Small pieces of the precious red coral have been found in Phil- 

 ippine waters, and a blue coral occurs which might be made into jewelry. 

 Many kinds of white coral are abundant. 



Oysters. — Oysters of good quality grow readily in the many tidal streams 

 about Manila. The industry could be greatly increased. 



REFERENCES 



Sponge and sponge fisheries of the Philippine Islands, Philippine Journal 

 of Science, Sec. A (1909), vol. 4, No. 1, 57-65. Sponges of Mindanao and 

 Sulu (in manuscript). 



Philippine tortoise shell, Phil. Journ. Sci., Sec. D (1911), vol. 6, No. 6, 

 291-295. 



Philippine trepang, Phil. Journ. Sci., Sec. D (1911), vol. 6, No. 6, 283-289. 



Philippine shark fin, Phil. Journ. Sci., Sec. D (1911), vol. 6, No. 6, 289- 

 291. 



Philippine corals, Phil. Journ. Sci., Sec. D (1911), vol. 6, No. 6, 305-308. 



PHILIPPINE BUREAU OF SCIENCE CHART 14 



BUREAU OF SCIENCE AQUARIUM AND MAIN BUILDING 



[See cards in large frame and prints in photograph stand.] 



Bureau of Science aquarium. — The aquarium of the Bureau of Science 

 is situated in Manila on Calle Gral. Luna within the bastion of Puerto 

 Real of the old city wall. The building is a substantial one-story structure 

 of reenforced concrete. It consists of a single corridor or tunnel, 85 meters 

 long and 8 meters wide. There are twenty-seven exhibition tanks, each 

 of which is faced with 1-inch plate glass. The tanks are lighted by sky- 

 lights, and the backs of the tanks slope, so that there is no unlighted corner. 

 Practically all of the light in the corridor comes through the tanks. Two 

 large tanks outside of the corridor, each about 12 meters in diameter, 

 afford accommodation for crocodiles, sharks, and turtles. In the Bureau 

 of Science aquarium there is at all times an interesting display of bright- 

 colored and curious fishes, sea anemones, crabs, sea urchins, star-fishes, 

 and other sea animals found in the waters of the Philippine Islands. 



