598 Philippine Journal of Science 1919 
TaBLE XVI.—Physical tests of rope made from the bast of Sterculia 
oblongata. 
[Rope made at Disdis, Benguet Subprovince.] 
Mean diameter: 
Millimeters iZga 
Inches 0.48 
Mean perimeter, or girth: 
Millimeters 38 
Inches 1.50 
True mean sectional area: 
Square millimeters 96.0 
Square inches 0.149 
Ultimate tensile strength (dry): 
Mean in kilograms ‘ 382 
Maximum in kilograms 413 
Minimum in kilograms 351 
Mean in pounds ‘ : 842 
Maximum in pounds 920 
Minimum in pounds ° 775 
Ultimate tensile strength (wet) : 
Mean in kilograms 279 
Maximum in kilograms 327 
Minimum in kilograms 241 
Mean in pounds 615 
Maximum in pounds 720 
Minimum in pounds 530 
Mean ultimate tensile strength per unit area (dry): 
_ Kilograms per square centimeter 398 
Pounds per square inch 5,650 
Mean ultimate tensile strength per unit area (wet): 
Kilograms per square centimeter 291 
Pounds per square inch 4,130 
Mean elongation at instant of rupture: 
Dry (per cent) 13 
Wet (per cent) 14 
Mean weight per unit length: 
Grams per meter 85.1 
Pounds per foot 0.0572 
Average breaking length: 
Meters 4,490 
Feet 14,700 
Moisture (per cent) 13.05 
STERCULIA STIPULARIS R. Br. Bonotan. 
Local names: Bisong (Nueva Vizcaya); bonotan, rapok (Ilocos Norte) ; 
burtgat (Cagayan); labnai (Abra, Itneg); malagasdha (Tayabas). | 
A medium-sized tree with oblong-ovate, rusty-pubescent, en- 
tire, acuminate leaves; flowers numerous, calyx-lobes elongated ; 
capsules red, inflated; widely distributed in the Philippines at 
low altitudes. 
