174 Trans. Acad. Set. of St. Louis. 



lookup 1.16 per cent of water had 15.40 per cent of lime 

 added to it. Then on retesting it took up 6.25 per cent of 

 water. Per cent of lime corresponding to 1.16 per cent of 

 water equals 3.60. This plus the 15.40 per cent added equals 

 19.00 per cent. Lime corresponding to 6.25 per cent of water 

 equals 19.44. 



We conclude from our experiments that if a Portland cement 

 containing less than 10 per cent of alumina takes up more 

 than three per cent of water then this excess is due to the free 

 lime present. 



Isiued December 4, 1903. 



