a hiram bingham, the discoverer of Machu picchu, wrote in his book, acrosssouth america, of a plant he had heard of whose juices softend rock so that i couls be worked into tightly fitted masonary.
a colonal fawcett,
told of how he had heard of that the stones were fitted togeather by means of a liquid that softened stone to the consistency of clay. brian fawcett, who edited his farthers book, mentions a freind who worked who worked at a mining camp at 14,000 feet at cerro di pasco in central peru. discovered a jar in an incan or pre-incan grave. he opened the jar thinking it was chicha, a alcoholic drink, accedently knocking the jar over onto a rock.
about ten minutes i lent over the rock and casually examined the pool of spilled liquid, it was no longer liquid, the patch where it was spilled was now like a patch of wet cement. it was as if the stone had melted , like wax, under the influence of heat.
fawcett seemed to think that the plant might be found in the pyrene river in the chuncho countyof peru and described it to having dark reddish leaves and being about a foot high