FIFTEENTH ANNUAL REPORT 59 



collected by the crudest methods. Domesticated bees have been imported. 

 Apiculture has not been developed, but could be carried on in connection 

 with farming to the extent of excluding imported honey. 



Silkworms. — The Bureau of Science has introduced silkworms into the 

 Philippine Islands and has developed a hybrid which yearly has nine gene- 

 rations. Silkworms are not attacked by disease in the Philippines. Their 

 food, the mulberry, grows most luxuriantly in all parts of the Islands and 

 is free from pests. A hectare (2.47 acres) (of 1,100 trees) will feed about 

 three million silkworms per annum, and leaves may be harvested at the 

 end of two years after cuttings have been planted. There is an excellent 

 market for all the silk that can be produced. 



KEFERENCES 



A manual of Philippine birds, Bureau of Science publication No. 2. Birds 

 in their economic relation to man through agriculture and forestry. Bureau 

 of Science press bulletin 32. Birds in their economic relation to man, 

 Bureau of Science press bulletin 32, revised. 



A manual of Philippine silk culture. Bureau of Science publication No. 4. 

 Planting and care of mulberry trees, Bureau of Science press bulletin 55. 



PHILIPPINE BUREAU OF SCIENCE CHART 16 



TOBACCO 



[See prints in photograph stand.] 



About one-quarter billion cigars worth $5,000,000 (^10,000,000), of which 

 5 per cent are exported to the United States, are manufactured in the 

 Philippine Islands annually. About four and one-quarter billion cigarettes 

 are manufactured annually. It has been demonstrated by the Bureau of 

 Science that 100 per cent immunity from the cigarette beetle, which has 

 caused Philippine cigars to be rejected in the European and American 

 markets, can be assured, if the manufacturer will properly protect his 

 stock of raw and prepared tobacco while in the factory. 



REFERENCES 



Problems in economic entomology in the Philippines, Philippine Journal 

 of Science (1906), vol. 1, No. 10. The cigarette beetle (Lasioderma serri- 

 corne Fabr.) in the Philippine Islands, Phil. Journ. Sci., Sec. D (1913), vol. 

 8, No. 1, 1-42. 



The cigarette beetle as a destroyer of tobacco. Bureau of Science press 

 bulletin 30. The molds of cigars and their prevention. Bureau of Science 

 press bulletin 31. 



PHILIPPINE BUREAU OF SCIENCE CHART 17 



PHILIPPINE FIBERS AND TIE MATERIALS 



[See prints in photograph stand.] 



Abaca {Manila hemp). — Abaca is the most important fiber and export 

 product of the Philippine Islands. In 1916 abaca comprised 40 per 

 cent of the total exports and was about 140,000,000 kilograms valued at 

 $26,700,000 (^53,400,000). The purchaser is now protected in the materials 

 which he purchases due to Government supervision of grading. 



Maguey. — Frequently maguey and other fibers are cheaper than abaca 

 (Manila hemp) and are as satisfactory for many purposes. The export of 



