502 
The Philippine Journal of Science 
1921 
Per cent of average modulus of rupture. 
7 0 75 80 85 90 9 5 100 105 HO 115 120 125 130 
FlO. 13. Variability in modulus of rupture ; tangile, small specimens ; average 
modulus of rupture, 1,000 pounds per square inch; 70 tests. 
Per cent of average modulus of rupture. 
15 SO 85 30 95 100 105 HO (15 !Z0 (Z5 130 
Fig. 14. Variability in modulus of rupture; apitong, small specimens; 78 testa; 
average modulus of rupture, 10,080 pounds per square inch. 
