XIII, A, 2 Witt: Pottery in the Vicinity of Manila 63 



The average compressive strength of the bricks burned at 

 the pottery is 213.6 kilograms per square centimeter, or less than 

 the strength of any one of the specimens burned in the 

 Bureau of Science kiln. While the test at the pottery is a single 

 instance and connot be regarded as an average, the general 

 procedure of burning is always the same, and it is doubtful if 

 results very much higher than these would be ever obtained. 



