102 
above the surrounding plains. Its height is con- 
sequently triple that of the Monte Nuovo of 
Puzziiola, which rose up out of the earth in 1538. 
My drawing represents the volcano of Jurullo 
(Xoralio or Jiiruyo), surrounded by several thou- 
sand small basaltic cones^ such as it appeared as 
we descended from Arco, and the hills of Aguas- 
arco, toward the Indian huts of the Playas. On 
the foreground is represented a part of the sa- 
vannah in which this enormous excrescence was 
formed on the night of the 29th of September^ 
1759. It is the ancient level of this disrupted 
soil^ now called by the name of Malpays. The 
fractured strata, seen in the foreground, separate 
the plain that has remained unbroken from the 
Malpays, which, bristling with small cones from 
six to nine feet in height, extends over four 
square miles. In the place where the thermal 
watei*s of Cuidmba and San Pedro descend to- 
ward the savannahs of Playas, the elevation of 
the broken strata is only twelve metres ; but the 
ground raised up has the form of a bladder, and 
its convexity progressively increases toward the 
centre, so that at the foot of the great volcano 
the soil is elevated 1 60 metres above the Indian 
huts we inhabited in the Playas de Jorullo. The 
profile, published in the Geographical and Phy- 
sical Atlas, which accompanies the historical 
narrative, will render this statement of the dif- 
