I may have raised an inquiry a few moments since which ought to be answered. I said, in effect, that in treating a positive disease, such, for instance, as acute, inflammatory rheumatism or acute pleurisy, I would use the positive pole on the inflamed parts, and the negative pole on either some healthy part or on a morbidly negative part, if I could find such. So, too, I said I would treat a negative disease, such as amaurosis or torpidity of liver, with the negative pole, placing the positive pole on either some healthy or morbidly positive part. The query may have arisen, "By placing the one pole or the other on a healthy part, do you not derange the normal electro-vital action there, disturbing its healthy polarization?" I answer, yes, for the time being, I do; and if this disturbing force were to be steadily continued for any considerable time, the disturbance would produce manifest and serious disease. But then, a pole or electrode, placed on a healthy part, we generally move, or ought to move, more or less, every few moments, which prevents the establishment of any perverted action in the part; and the moment the electrode is withdrawn, the normal polarization and healthy action are resumed. USE OF THE LONG CORD. It is often desirable to bring the entire parts of the patient, through which the current is made to pass, under one and the same kind of influence--such as shall make them all more positive or more negative. Especially is this true in many cases where we wish to run through but a _short_ space. For this purpose, there is frequent advantage in using conducting cords of unequal length. As my views on this point have been disputed in certain quarters, I will endeavor here to place them in such a light that they shall not be rejected for want of being _rightly understood_. I have previously remarked[C] that, for practical purposes, it is sufficiently exact to consider the _magnetic circuit_ as extending only from the _positive post_, around through the conducting cords, the electrodes, and the person of the patient, to the _negative post_. We will so regard it at present. This circuit may be viewed as one continuous magnet, made up of several sections or shorter magnets placed end to end--the positive end of the first to the negative end of the second, and the positive end of the second to the negative end of the third. In this arrangement, the negative end of the first section is the negative pole of the one whole magnet, and the positive end of the third section is the positive pole of the whole magnet. The minimum quantity of the magnetism is supposed to be at the negative pole, and the maximum quantity at the positive pole; and the quantity is supposed to increase, by _regular graduation_, from the negative to the positive pole. This being so, the quantity is _the same_ in the positive end of either section and the negative end of the adjoining section, at their point of contact.