The volcano Jorullo, twenty leagues south of Patzcuaro, was first made known to men of science in Europe by Humboldt's account of it.
In the middle of the eighteenth century the site of this volcano was covered with peaceful fields of sugarcane, cotton, and indigo, watered by artificial means, belonging to the plantation of San Pedro de Jorullo. In June, 1759, for the first time, hollow noises from under the ground began to make themselves heard, and in September a tract of ground three or four square miles in extent humped up like a bubble. Thick vapors, smoke, and flames were seen to issue from this area, which rose and fell like the ocean. Large masses of rock and earth sprung up as if from a chasm, and the highest of these developed into a volcano, which burned steadily, throwing up lava and hot ashes for several months.
The Indians were greatly terrified by such a spectacle, as well they might be. Flames were seen at Patzcuaro, and even at Querétaro, many miles away. The roofs of houses were covered with ashes, and the rich plantations of San Pedro reduced to a barren plain. They believed that some missionary monks who were ill received at the plantation poured out horrid imprecations upon the fertile spot, and prophesied that it should be swallowed up by flames rising out of the earth. Whether these vindictive monks had anything to do with it or no, the hacienda of Jorullo was destroyed, all the trees thrown down and buried in sand and ashes from the volcano. The field and roads were covered with sand, crops destroyed, and flocks perished, unable to drink the infected water.
