“The history of my researches,” says M. de Tristan, “is simply this. Some twenty years ago, a gentleman who, from his position in society, could have no object to gain by deception, showed to me, for my amusement, the movement of the divining rod. He attributed the motion to the influence of a current of water, which appeared to me a probable supposition. But my attention was more engaged with the action produced by the influence, let the latter be what it might. My informant assured me he had met with many others in whom the same effects were manifested. When I returned home, and had opportunities of making trials under favourable circumstances, I found that I myself possessed the same endowment. Since then I have induced many to make the experiment, and I have found a fourth, or certainly a fifth, of the number capable of setting the divining rod in motion at the very first attempt. Since that time, during these twenty years, I have often tried my hand, but for amusement only, and desultorily, and without any idea of making the thing an object of scientific investigation. But at length, in the year 1822, being in the country, and removed from my ordinary pursuits, the subject again came across me, and I determined forthwith to try and ascertain the cause of this phenomena. Accordingly, I commenced a long series of experiments, from fifteen to eighteen hundred in number, which occupied me nearly fifteen months. The results of above twelve hundred were written down at the time of their performance.” The scene of the Count’s operations was in the valley of the Loire, five leagues from Vendôme, in the park of the Chateau de Ranac. The surface of ground which gave the desired results was from seventy to eighty feet in breadth. But there was another spot equally efficient at the Count’s ordinary residence at Emerillon, near Clery, four leagues south of Orleans, ten leagues south of the Loire, at the commencement of the plains of Solonge. The surface ran from north to south, and had the same breadth with the other. These “exciting tracts” form, in general, bands or zones of undetermined, and often very great length. Their breadth is very variable; some are only three or four feet across, while others are one hundred paces. These tracts are sometimes sinuous; in other instances they ramify. To the most susceptible they are broader than to those who are less so. M. de Tristan thus describes what happens when a competent person, armed with a hazel-fork, walks over the exciting districts:—