In Florentine Pietra Dura work, the inlay of two hard and equally cut materials reached its climax.

The art of Pietra Dura mosaic began under Cosimo I. who imported it, if one may use such an expression, from Lombardy.

Yesterday we visited the church of San Lorenzo, the Laurentian library, and the Pietra Dura manufactory, and afterwards spent an hour in the Tribune.

" Pietra Dura" was a mosaic laid upon either a thick wood or a marble foundation.

Pietra Dura reached its climax, there being in Florence at this time a most noted Frenchman, Luigi Siriès, who settled in Florence in 1722.