The Elsa and the Era, which join it on its left bank, descending from the hills near Siena and Volterra, are inconsiderable streams; and the Serchio, which flows from the territory of Lucca and the Alpi Apuani, and formerly joined the Arno a few miles from its mouth, now enters the sea by a separate channel.
The most considerable rivers of Tuscany south of the Arno are the Cecina, which flows through the plain below Volterra, and the Ombrone, which rises in the hills near Siena, and enters the sea about 12 m.
Boracic acid is chiefly found near Volterra, where there is also a little rock salt, but the main supply is obtained by evaporation.
The podestd and the capitano assenting to this treachery, he dismissed the gonfaloniere, reduced the priori to a position of impotence, disarmed the citizens, and soon afterwards accepted the lordship of Arezzo, Volterra, Colle, San Gimignano and Pistoia.
In 1472 a quarrel having arisen with Volterra on account of a dispute concerning the alum mines, Lorenzo sent an expedition against the city, which was sacked and many of the inhabitants massacred.
Ferruccio, who had recaptured Volterra, marched to Gavinana above Pistoia to attack the Imperialists in the rear.
VOLTERRA (anc. Volaterrae), a town and episcopal see of Tuscany, Italy, in the province of Pisa, from which it is 51 m.
Volterra preserves its medieval character, having suffered little modification since the 16th century.
Persius the satirist and the painter Daniele da Volterra were both natives of the town.
See C. Ricci, Volterra (Bergamo, 1905); E.
The large deposits at Falun in Sweden occur with serpentine in gneiss, and those at Montecatini, near Volterra in the province of Pisa, serpentine and gabbro.