ITALY. LETTER XIV. 



LETTER XIV. 



Rome, April 10, 1772. 



IN this Letter I (hall give you an account of 

 my journey to TVw//, Paleftina, and Fref- 

 cati, and of fome places nearly adjacent to Rome. 

 From Rome to 'Tivoli I went over fields and 

 hills of volcanic afhes or tufo, to the ruined Caftell* 

 Arcione. Here I faw calcareous incruftations of 

 roots and plants, commonly called cfteocolla. They 

 are owing to the inundations of the Lago di far- 

 tari t fituated at the left of the road. Its water 

 has a ftrong fmell of btpar fulpburit, and gets its 

 calcareous particles either from the depth or from 

 the neighbouring Apennines. On the other fide of 

 the Lago de' Tartari, till we came to Ztvoli, the 

 inferior volcanic afties are almoft every where co- 

 vered by thefe calcareous ofteocolla. Somewhat 

 further, and to the left, is Lago di Zolfo, and 

 Lago de* Bagni, both fmelling like btpar fufpfa- 

 ris. Though cold, it throws up from the bottom 

 large air-bladders like boiling water, efpecially if 



ftones 



