I don't know what ails you this morning; but if you go on this way I shall call you Professor silex all the time.
The tower we see there was that of the windmill which ground the silex.
Then, on the terrace above, there is an arcade paved with blocks of silex, and on one side shops.
At the bottom of each pore a thin lamella of silex, perforated by four to six irregular, roundish, double-contoured porules.
They had implements of copper, as well as of silex, and porphyries.
All this rich land was thickly strewed with small fragments of fossil wood, in silex, agate, and chalcedony.
It seems to consist of a saturated solution of sand: when a handful is taken up, a grey mud of silex remains in the palm.
In clay it finds the best constituents of its development—moisture, silex, lime and alumnia.
In all other Radiolaria the skeleton is composed of silex or of a silicate.
This last is composed of common carbonate of lime and silex, but the quantity of each has not been accurately determined.