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above the surrounding plains. Its height is con- 

 sequently triple that of the Monte Nuovo of 

 Puzzuola, which rose up out of the earth in 1538. 

 My drawing represents the volcano of Jurullo 

 (Xorullo or Juruyo), 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 Play as. 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 

 waters of Cuitimba 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 160 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- 



