Von Reichenbach next came upon the observation that the human hand gives out the Od force; and that the right hand displays the characters of negative Od, the left those of positive Od. The more sensitive subjects recognised, in the dark, the appearance of dim flames proceeding from the tips of his fingers; and all felt the corresponding sensations of drafts of cool or of warm air. Subsequently the whole body was found to share the properties of the hands; the entire right side to manifest negative Od, the entire left side positive Od. So, in reference to this new force, the human body exhibits a transverse polarity; the condition is thus realized which is required to belong to the hypothetical force through which the divining rod might be supposed to move. If any terrestrial influence were capable of disturbing the Od force in the body, however it might affect its intensity, a current or circuit could only be established through the arms and hands; unless, indeed, some extraordinary means were taken, such as employing an artificial conductor, arched half round the body, to connect the two sides. The sensations which attend the establishment of a current of Od and interferences with it, in sensitive subjects, are exemplified in the following observations:— A bar magnet was laid on the palm of the left hand of one of the most sensitive subjects, with its southward pole resting on the end of her middle finger, the northward pole on the fore-arm above the wrist. It thus corresponded with the natural polar arrangement of the Od force in the patient’s hand and arm. Accordingly, no sensation was excited. But when the position of the magnet was reversed, and the northward pole lay on the end of the middle finger of the left hand, an uneasy sense of an inward conflict arose in the hand and wrist, which disappeared when the magnet was removed or its original direction restored. On laying the magnet reversed on the fore-arm, the sense of an inward struggle returned, which was heightened on joining the hands and establishing a circuit. When the patient completed the circuit in another way—namely, by holding a bar magnet by the ends, if the latter were disposed normally, (that is, if the northward pole was held in the left hand, the southward pole in the right,) a lively consciousness of some inward action ensued. A normal circulation of Od was in progress. When the direction of the magnet was reversed, the phenomenon mentioned in the last paragraph recurred. The patient experienced a high degree of uneasiness, a feeling as of an inward struggle extending itself to the chest, with a sense of whirling round, and confusion in the head. These symptoms disappeared immediately upon her letting go the magnet.