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For many ycars an obj ective of research on portland cement has been the correlation of the properties of the cements with their chemical constitu tion. This correlation requires the determination of the compositions of the mineral compounds in portland cement and the development of methods of calculating the rdative nmounts of each of these from the resul ts of chemical analyses. Although notable progress , JaS been made, errors in the estimates of the relative amounts of the minerals sometimes are large. These errors are partly due to inaccuracies in the estimate of the amount of glass, some of which is always present in portland cement . The determination of the glass content is based, in par t , on values of the heats of solution of the individual minerals. The es timated glass eontent, therefore, will be in error unless the true substances present are recognized. Reeently there was announced the discovery in the ternary system CaO-AI20 3-Fe20 3 of a compound [1 ]1 hexacalcium dialumino ferrite, 6CaO.2AI20 v Fe20 3' There was also found a complete series

Heats of solution of solid solutions of hexacalcium dialumino ferrite and dicalcium ferrite