DOMAIN V. CALCAREOUS. 



from Arcueil to Paris; and these canals werft 

 entirely filled with the same sediment which 

 that water deposes, even now, on the surface 

 of all bodies on which it remains a certain 



Some establish a distinction between tufa and 

 sinter ; that the former is deposited in the open 

 day, while the latter is formed under ground. 

 But this seems arbitrary ; and depositions of the 

 purest alabaster, or alabastrite, may be equally 

 formed in the open air, as at the Baths of St. 



st.Feiippe. Philip, in Tuscany, where they appear equal to 

 the most beautiful marbles, being received in 

 moulds with the heads of Roman Emperors, and 

 other objects. This ingenious manufacture was 

 established by Mons. Vegni. But such objects 

 belong to lithology ; and the name of tufa will 

 ever imply a coarse stone used in architecture. 



Travertine. Of this kind, by far the most celebrated is the 

 travertino, already mentioned; as it has been 

 employed, both in ancient and modern times, in 

 the construction of the most magnificent edi- 

 fices of the most magnificent city in the worldf . 

 Hence a more particular account will be found 



* Brard, 466. 



f For example, the Coliseo or Flavian amphitheatre. Petrini, 

 i. 138, says the Travertino is of a sweet yellowish white, and 

 hardens by time. 



