Crystal Gazing by Zancigs, worlds greatest mind reader, the unseen world, treatise on the art of concentration, cover image, with engraving of mystic and crystal ball, 1900. (Photo by JHU Sheridan Libraries/Gado/Getty Images)
Crystal Gazing by Zancigs, worlds greatest mind reader, the unseen world, treatise on the art of concentration, cover image, with engraving of mystic and crystal ball, 1900. (Photo by JHU Sheridan Libraries/Gado/Getty Images)