In an interview in 1983, Jorge A. Lira, a Catholic priest who was an expert in Andean folklore, said that he had rediscovered the ancient method of softening stone. According to a pre-Columbian legend the gods had given the Indians two gifts to enable them to build colossal architectural works such as Sacsayhuaman and Machu Picchu. The gifts were two plants with amazing properties. One of them was the coca plant, whose leaves enabled the workers to sustain the tremendous effort required. The other was a plant which, when mixed with other ingredients, turned hard stone into a malleable paste. Padre Lira said he had spent 14 years studying the legend and finally succeeded in identifying the plant in question, which he called ‘jotcha’. He carried out several experiments and, although he managed to soften solid rock, he could not reharden it, and therefore considered his experiments a failure.4 Aukanaw, an Argentine anthropologist of Mapuche origin, who died in 1994, related a tradition about a species of woodpecker known locally by such names as pitiwe, pite, and pitio; its scientific name is probably Colaptes pitius (Chilean flicker), which is found in Chile and Argentina, or Colaptes rupicola (Andean flicker), which is found in southern Ecuador, Peru, western Bolivia, and northern Argentina and Chile. If someone blocks the entrance to its nest with a piece of rock or iron it will fetch a rare plant, known as pito or pitu, and rub it against the obstacle, causing it to become weaker or dissolve. In Peru, above 4500 m, there is said to be a plant called kechuca which turns stone to jelly, and which the jakkacllopito bird uses to make its nest. A plant with similar properties that grows at even higher altitudes is known, among other things, as punco-punco; this may be Ephedra andina, which the Mapuche consider a medicinal plant.5