Kircher also "experimentalized several times on wooden rods which were declared to be sympathetic with regard to certain metals, by placing them on delicate pivots in equilibrium; but they never turned on the approach of metal." (De Arte Magnetica.) However, a similar course of experiments over water led him to attribute to the rod the power of indicating subterranean springs and water-courses; "I would not affirm it," he says, "unless I had established the fact by my own experience." Dechales, another Jesuit, author of a treatise on natural springs, and of a huge tome entitled "Mundus Mathematicus," declared in the latter work, that no means of discovering sources is equal to the divining rod; and he quotes a friend of his who, with a hazel rod in his hand, could discover springs with the utmost precision and facility, and could trace on the surface of the ground the course of a subterranean conduit. Another writer, Saint-Romain, in his "Science dégagée des Chimères de l'École," exclaims, "Is it not astonishing to see a rod, which is held firmly in the hands, bow itself and turn visibly in the direction of water or metal, with more or less promptitude, according as the metal or the water are near or remote from the surface!" In 1659 the Jesuit Gaspard Schott writes that the rod is used in every town of Germany, and that he had frequent opportunity of seeing it used in the discovery of hidden treasures. "I searched with the greatest care," he adds, "into the question whether the hazel rod had any sympathy with gold and silver, and whether any natural property set it in motion. In like manner I tried whether a ring of metal, held suspended by a thread in the midst of a tumbler, and which strikes the hours, is moved by any similar force. I ascertained that these effects could only have rise from the deception of those holding the rod or the pendulum, or, may be, from some diabolic impulsion, or, more likely still, because imagination sets the hand in motion." The Sieur le Royer, a lawyer of Rouen, in 1674, published his "Traité du Bâton universel," in which he gives an account of a trial made with the rod in the presence of Father Jean François, who had ridiculed the operation in his treatise on the science of waters, published at Rennes in 1655, and which succeeded in convincing the blasphemer of the divine Rod. Le Royer denies to it the power of picking out criminals, which had been popularly attributed to it, and as had been unhesitatingly claimed for it by Debrio in his "Disquisitio Magica."