274 TRAV.E.L'S THROUGH 



pietra turthina, or colwnharia, now and then arc 

 found veins and nodules of coals. 



4, Cava di Pietra arenaria ml Ciardino di Eoboli. 

 The high hill, on which this garden is fituated, is 

 towards the plain of the Palace Pitti, by nature 

 cut off and (haggy. It is here that they dig a^ 

 yellow fand-ftone, which is employed in building. 

 But under and above this fand-rock is-pittra forte -, 

 accordingly this hill is diftingui(he4 only by this 

 accidental land- bed from the other Florentine-hills; 

 which, upon nearer enquiry, might offer- the fame 

 phenomenon*. The vifible beds in this hill are 

 from the. furface to the depth as follows, i. Many- 

 thin beds of > petrified clay or marie, that is to fay, 

 Bardelloni and Pietra forte bigia, which alternate^- 

 but are too thin to be employed in pavings ; 

 on the furface likewife marked by fpar-lines which 

 are rhombo'ides. 2. A bed of yellow fand-ftone,- 

 mixed with fome lime; therefore aired upon by 

 acids; and proper for building. 3. Pietra font 

 turchina r or columbina* 



5. Montague di Gablro intorno Impruneta ; feven 

 Italian miles diftant from Florence towards the 

 South. The hills about Itnprunsta confift of 

 Gabbro or Serpentine- ftone> commonly thereabout 

 dug out of feveral hills, and employed in the floor* 

 and decorations of palaces and churches, as -may 

 be fecn, for example in the church of the beau- 

 tiful 



