Twelfth Annual Report of the Bureau of Science— 1913.] 



• Uixn \ 



20% water "^ 

 5tEamEii Pat 

 €-7-13. 



Mixfn 

 2( % water 

 SteamEci PaL\ 



5-7-13. 



/ 



Mix. ^111 



20%watEr 

 Steamed Pat. 



6-7-13. 



Mix^IV 



20%watEr 



StEamed Pat 

 6-7-13, 



PLATE XLIX. PORTLAND CEMENT MANUFACTURED FROM PHILIPPINE RAW MATE- 

 RIALS, SHOWING PERFECT SOUNDNESS OF FOUR DIFFERENT MIXTURES FROM ONE 

 DISTRICT. 



