E. Sidney Hartland, Folk-Lore (1893)
“ I venture to submit, then, that the practices of throwing pins into wells, of tying rags on bushes and trees, of driving nails into trees and stocks, and the analogous practices throughout the Old World, are to be interpreted as acts of ceremonial union with the spirit identified with well, with tree, or stock. In course of time, as the real intention of the rite has been forgotten, it has been resorted to (notably in Christian countries) chiefly for the cure of diseases, and the meaning has been overlaid by the idea of the transfer of the disease. ”
