The investigations of Baron Reichenbach added a new class of sensitives. Reichenbach announced the doctrine of an "odic" force or "odyle," streaming forth from magnets and from the human frame, and affecting the human system; certain sensitives could see these emanations, and magnetized subjects at once become "odic" sensitives. The doctrine that certain persons are sensitive to metals was an ancient one. It reappeared in the myths that were woven about Casper Hauser, the wild boy of Nuremberg (1828), who gave evidence of his unusual origin by shuddering in the presence of a needle, and evidencing intense agony in passing a hardware shop. Miss Martineau's J. holds a piece of steel so tightly that no one can wrench it from her, but touch the steel with gold and it falls from her hands at once. The following citation will show how this movement was utilized in mesmeric practices: "But to ascertain whether he (a Major Buckley, a mesmerist) can obtain conscious clairvoyance, he makes slow passes from his own forehead to his own chest. If this produces a blue light in his face, strongly visible, the subject will probably acquire conscious clairvoyance. If not, if the light be pale, the subject must first be rendered clairvoyant in the sleep. Taking those subjects who see a very deep blue light, he continues to make passes over his own face, and also over the object, a box or a nut, for example, in which written or printed words are inclosed, which the clairvoyant is to read. Some subjects require only a pass or two to be made clairvoyant, others require many. They describe the blue light as rendering the box or nut transparent, so that they can read what is inside. If too many passes be made by Major B., the blue light becomes so deep that they cannot read, and some reverse passes must be made to render the light less deep. Major Buckley has thus produced conscious clairvoyance in eighty-nine persons, of whom forty-four have been able to read mottoes contained in nut-shells, purchased by other parties for the experiment."