| It is evident that this will form a pozzuolanic cement if a suitable silicious material such as trass is added to the cement. |
| But the trass boy finished his remarks about destiny in a very short time. |
| Sometimes a proportion of common sand mortar instead of lime is mixed with the trass. |
| After it has been quarried it is ground in mills, and used for cement stone under the name of trass. |
| He wished that the trass boy would talk forever about destiny. |
| The Dutch are very attentive in ascertaining the quality of the trass before using it in building their dikes. |
