Objections have been taken against these experiments, on the ground that their effects are purely subjective; that the results must be received on the testimony of the party employed; and that the best parties for the purpose are persons whose natural sensibility is exalted by disorder of the nerves; a class of persons always suspected of exaggeration, and even, and in part with justice, of a tendency to trickery and deception. But this was well known to Von Reichenbach, who appears to have taken every precaution necessary to secure his observations against error. And when I add, that many of the results which he obtained upon the most sensitive and the highly nervous, were likewise manifested in persons of established character and in good health, and that the fidelity of the author and of his researches is authenticated by the publication of the latter in Woehler and Liebig’s _Chemical Annals_, (Supplement to volume 53, Heidelberg, 1845,) I think you will not withhold from them complete reliance. In general, persons in health and of a strong constitution are insensible to the influence of Von Reichenbach’s new force. But all persons, the tone of whose health has been lowered by their mode of life—men of sedentary habits, clerks, and the like, and women who employ their whole time in needlework, whose pale complexions show the relaxed and therefore irritable state of their frames—all such, or nearly all—evince more or less susceptibility to the influence I am about to describe. Von Reichenbach found that persons of the latter class, when slow passes are made with the poles of a strong magnet moved parallel to the surface—down the back, for instance, or down the limbs, and only distant enough just not to touch the clothes—feel sensations rather unpleasant than otherwise, as of a light draft of air blown upon them in the path of the magnet. In the progress of his researches, Von Reichenbach found that the more sensitive among his subjects could detect the presence of his new agent by another sense. In the dark they saw dim flames of light issuing and waving from the poles of the magnet. The experiments suggested by this discovery afford the most satisfactory proofs of the reality of the phenomena. They were the following:—A horse-shoe magnet having been adjusted upon a table, with the poles directed upwards, the sensitive subject saw, at the distance of ten feet, the appearance of flames issuing from it. The armature of the magnet—a bar of soft iron—was then applied. Upon this the flames disappeared. They reappeared, she said, as often as the armature was removed from the magnet.