"I pass over an account of numerous experiments made by this intelligent and careful observer, pointing out the analogies of the known phenomena of electricity and magnetism, by modifications resulting to the sensibility of Bleton, and the rotation of the rod by various ingenious electrical and magnetic trials suggested by the inventive sagacity of Thouvenel, in order to arrive at the curious anticipations of some of Professor Faraday's discoveries, by means of the sensibility of Bleton and the invariable laws which regulated the rotation of the divining rod, when the experiments were made over places where various substances had been concealed under ground. It was found that whether the trials were made in this manner, or over masses of coal, subterraneous currents of water or metallic veins, the divining rod indicated a determined sphere of electric activity, and was, in fact, an _electrometrical rod_. 'Of all the phenomena relating to the distinction of fossil bodies,' says Thouvenel, 'acting by their electrical emanations, doubtless the most surprising is this: upon the mines of iron, of whatever kind they may be, the rods supported by the fingers of Bleton turned constantly on their axes from behind forward, as upon the mines of coal; while upon other metallic mines, as upon other metals extracted from their mines, the rotary movement took place in the contrary direction, that is to say, from before backward. This circular movement, which never varies while Bleton is in a perpendicular position over mines or upon metals, presents revolutions as rapid and as regular as the revolutions in the contrary direction upon the mines of iron and coal.'