xii, a. 3 Witt and Reyes: Calcium Sulphate on Cement 143 



5. The percentage loss in tensile strength of the neat briquettes 

 decreases as the age increases from seven days. 



6. No relation between the sulphuric anhydride content of 

 a cement and the effect of exposure to carbon dioxide is apparent. 



7. Results indicate that the formation of alkali carbonates is 

 not an important factor in the change of the physical properties 

 of cement during storage. 



