ITALY. LETTER XXI. 289 



LETTER XXI. 



Leghorn, June 9, 1772. 



BETWEEN Florence and Pifa the road 

 goes to the left of the Arno on the Hoping 

 of high mountains ; which confift firft of ma- 

 cigno, and afterwards of black and blueifh-grey 

 limeftone, in large beds. The hot wells of Pifa, 

 remarkable for their fine fituation and magnificent 

 buildings, fpring in thefe calcareous hills. They 

 are defcribed by feveral authors. The beft and 

 mod - modern are, CocchPs Differ tazione fopra i 

 bagni di Pifa. 4 to. Trait at o de\ bagni di Pifa del 

 D. Giov. Bianchi. Firenza, 1757, 8 vo. Analiji 

 delle acqus thermali di bagni di Pifa fatte dal D. 

 Eartclomeo Mefny. Firenza, 1758, 8vo. 



Mr. Targioni Tozzetti has told me, that near 

 the road between Florence and Pifa fome upper 

 ftrata in the hills confift of Breccia, which fome- 

 times contains holes with earth or duft. The hills 

 towards the fea, near Pifa, are faid to confift of 

 U marl ; 



