JfclODE Xn. TUFA. 5U 



than among the glutenites. Of this stone the 

 celebrated temple of Jupiter Otympius at Agri- 

 gentum, or Girgenti, in the south of Sicily, was 

 constructed, as appears from the ruins. The 

 coarse limestone of Saillancourt, used in build- 

 ing the beautiful bridge at Neuilly near Paris, 

 also approaches to this kind. 



The Travertine, with which the church of St. 

 Peter, at Rome, is constructed, is also a tufa, 

 daily formed in the waters of the Anio, now 

 called the Tiverone. 



A fine calcareous tufa is also formed in an- ofaqueduct*. 

 cient aqueducts, in like manner as we see it 

 every day in our tea-kettles. The ingenious 

 Brard says, " Being in Languedoc, towards the 

 middle of June, 1807, 1 visited the great Roman 

 aqueduct, known by the name of Pont du Card: 

 I ascended into the gallery which terminates this 

 bold monument, and in which, anciently, the 

 water ran which was conducted from Uzes to 

 Nismes : I observed that the sides and bottom of 

 this canal are encrusted with coarse tufa, 18 

 inches thick. In like manner also, and what 

 has happened under the eyes of the Parisians, 

 m when in new modelling the garden of the senate, 

 there was found, in digging the soil, canals; 

 which are said to be as ancient as the time of 

 Queen Blanche, and which brought the water 



