f 9'4 fRAVELS THROUGft 



feen, there appear in the compact limeftone-hills 

 feveral fmall horizontal ftrata of white-grey horn- 

 ftone-Jlints> alternating with the limeftone, two or 

 three inches thick. Some of them are half lime- 

 ftone and half flint *. 



From TivoK to Paleftrina the road defcends 

 from the city over calcareous fediments. Volcanic 

 tufo offers in the fame line with villa d'Adriano. 

 Hence the rain had walhed plenty of little black 

 fherl-cryftals; which, oppofite to the fun, made 

 the road refplendent and glittering all over ; the 

 Apennines in view to the right ; the high volcanic 

 hills of Frefcati to the left. Paleftrina is fituated 

 on a lamellated fhivery calcareous hill in the chain 

 of the Apennines. I faw in the palace the famous 

 antique Mufaico, which in former times was the' 

 floor of the Temple of Fortune. The blue ftones 

 coloured with- cobalt. 



From Paleftrina to Frafcati defcending from 



*' The Tranflator remembers to have feen a fimilar pheno- 

 menon in the limeftone quarries at Peterjberg.* near Gc/fcr, in 

 Germany, The limeftone is whitifli, of a fine grain, containing 

 fome fcarce petri factions of OJlrete majores, tenues t rugofa, Oftreo 

 pefiiniteS) Arttftotiitei, and Ecbini mammillares. Its beds are 

 turned up almoft to a vertical pofition ; and in their compaft 

 folid fubftance appear mafles of grey-brownifh hornftone flint* 

 which cannot be considered as adventitious, but are parts of 

 the marine ftratum in which they have been produced. 



Pale- 



