210 



ANNALS NEW YORK ACADEMY OF SCIENCES 



Effect of gaging with various solutions upon the strength of mortars 

 afterward stored in water. The above tests do not show, of course, a 

 normal condition, since no water came into contact with the cement 

 after it had set. Working with more porous material, a 1 : 3 mortar, so 

 that in storage a heightened subsequent water action might take place, 

 the following results were obtained : 



TABLE 10 



Effect of various Salts dissolved in tlie Mixing Water, upon tlie Strength of 



1:3 Mortar 



(Sand, screened Cow Bay. Specimens stored in damp closet for 24 hours, then 

 continuously in water for the rest of period) 



