52 THE BUREAU OF SCIENCE 



349-374. Some Philippine tan barks (article in manuscript intended for 

 publication in the Philippine Journal of Science). 



Philippine fibers and fibrous substances; their suitability for paper 

 making, Phil. Journ. Sci. (1906), vol. 1, No. 5, 433-463; No. 10, 1075-1085; 

 Sec. A (1907), vol. 2, No. 2, 81-113; (1910), vol. 5, No. 4, 233-255. Bamboo 

 for paper pulp in Bataan Province, Luzon, Phil. Journ. Sci., Sec. A (1912), 

 vol. 7, No. 2, 121-123. Philippine bamboo, fibers, and grass as materials 

 for paper and paper pulp, Bureau of Science press bulletin 53. 



PHILIPPINE BUREAU OF SCIENCE CHART 7 



PORTLAND CEMENT, LIME, AND LIME PRODUCTS 



[See prints in photograph stand.] 



Portland cement. — Imports of Portland cement during recent years have 

 had an average annual market value of about $750,000 (?=1, 500,00) . The 

 local consumption is certain to increase as the country progresses in finan- 

 cial and industrial importance. The Rizal Cement Company has a small 

 plant at Binangonan. The Bureau of Science has made excellent Portland 

 cement from several local raw materials. In Cebu desirable materials 

 occur adjacent to undeveloped coal fields, the fuel from which is suitable 

 for burning cement. 



Lime. — Excellent coralline and crystalline limestone suitable for the 

 manufacture of lime occur throughout the Archipelago, and experiments 

 of the Bureau of Science show that superior lime may be produced from 

 any of these. The lime heretofore produced is of inferior quality, and much 

 of that used for sugar manufacture and for other chemical purposes has 

 been imported. The increased production of sugar by modern methods has 

 so augmented the demand for lime that there is now a need for the output 

 of large kilns. The crude lime of local manufacture sells for as much as 

 $15 (?=30) per ton. This price is sufficient to ensure a handsome profit for 

 good lime. Hydrated lime should find extensive use for road-building and 

 for waterproofing concrete. 



Lime products. — In connection with a lime kiln the operation of a 

 bleaching-powder plant and a sand-lime brick plant appear attractive. The 

 value of bleaching powder consumed in Manila alone amounts to $12,500 

 (f*=25,000) per annum. Conditions are favorable in the Philippines for the 

 commercial manufacture of bricks, building blocks, tiles, slabs, and or- 

 namental stones from sand and lime. The cost of manufacture is sufficiently 

 low to enable them to compete with the other building materials. 



REFERENCES 



Volcanic tuff as a cement material, Philippine Journal of Science, Sec. 

 A (1908), vol. 3, No. 5, 391-497. Philippine raw cement materials, Phil. 

 Journ. Sci., Sec. A (1909), vol. 4, No. 3, 211-229. The efficiency of Port- 

 land cement raw materials from Naga, Cebu, Phil. Journ. Sci., Sec. A 

 (1914), vol. 9, No. 2, 127-149. Geological and field relations of Portland 

 cement raw materials at Naga, Cebu, Phil. Journ. Sci., Sec. A (1914), vol. 

 9, No. 2, 151-161. 



The nonmetallic minerals. Mineral Resources P. I. for 1907-1912 (1908- 

 1913). The manufacture of lime in the Philippine Islands, Phil. Journ. 

 Sci., Sec. A (1916), vol. 11, No. 3, 129-133. 



Sand-lime brick and artificial sandstone in the Philippines, Phil. Journ. 



