1. Where the organism is in health, the momentary application to the patient of the negative pole of the double Faradaic current B D—the best for diagnostic use—in good medium strength,[D] will be directly felt, yet will cause no pain. Whatever muscular contractions may be produced for the time, they are harmless, and need not be noticed. Wherever the electro-vital fluid is in excess, producing hypersthenia—too much vital action—the part is morbidly positive; and, excepting sometimes in the stomach and bowels, the B D current, of medium force, directed to that part under the negative pole, will produce sharp pain. But where a current of full medium strength can not be felt under the negative pole, there is a morbidly negative state—a deficiency of vital action—a condition of at least partial paralysis—anæsthesia.
2. In a state of health, different persons will have different degrees of sensibility to the electric current, depending on their varied nervous susceptibility. Again, the same person will be much less sensitive to the current when directed to the spine, particularly the lower part of it, and to the stomach, than when directed to most other parts. Also, where bones lie near the surface, the periosteum—the membrane immediately investing the bone—is apt to feel more sensibly under the electrodes than the muscular parts. But these variations soon become so familiar to the practitioner that he finds no difficulty in making the proper allowances for them.
In making an electrical examination, the two following questions present themselves to be answered: First, whether anywhere, and, if so, where is there a morbid electrical state in the body of this patient? Second, what is the electrical condition of that unhealthy part? Is it positive or negative?
These questions being answered, according to the tests just given, the well-instructed practitioner is prepared to go on and treat the patient judiciously, and with success, if success be attainable by any form of medication.
Let me next say, It is best, as a general rule, to make examinations with the negative pole. The reason of this is that, since the current is always more energetic under the negative than under the positive pole, it makes itself more sensibly felt there than under the positive pole. Indeed, it will commonly be felt even to painfulness there, if the part were overcharged and inflamed before. Thus, under the negative electrode, the current readily detects any active disease. But, if we be making the examination with the positive pole, as we come upon any point more or less inflamed, the current, quick as lightning, rushes away from such inflamed part to the part under the stationary negative pole, carrying with it, for the time being, more or less of that excess of electro-vital fluid which was in force at the inflamed point; so that no pain, perhaps, is experienced there; and thus the disease escapes detection.
I am aware that it has been said by some of our practitioners, with, if I rightly remember, the able discoverer of the grand practical principles of our system, Prof. C. H. Bolles, at their head, that it is not quite prudent to use the negative pole in hand for diagnosis, lest we possibly contract the disease from the patient; since, in that case, the current runs from the patient to the practitioner. They think it safer to use the positive pole in hand; so letting the current run from the practitioner to the patient. There is force in this consideration, without doubt, where the patient is affected with a poisonous or malignant disease. And where any thing of this nature is apprehended, I would never examine with the negative pole in hand. But these cases are commonly so manifest, or so easily determined by colloquial inquiry, that examination with the electric current is rarely if ever necessary. And when the disease is plainly not of a poisonous or infectious nature, I do not think there is any danger to be apprehended from the cause stated. I therefore prefer, as a general rule, to examine with the negative pole; and for the reason given above.
The temperature of the room and the adjustment of apparel should be the same as for treatment. To prevent improper chilliness, the room ought to be of such temperature that clothing is not required for bodily comfort—say, from 70 to 80 degrees, Fahrenheit. Seat the patient on a stool or chair, (a stool is most convenient), and yourself at his side, with your machine, ready for use, on a table or bench before him, and a vessel of warm water within easy reach. If the patient be a man we let his trunk be disrobed, giving free access to the back, chest and abdomen. If the patient be a woman, let her be covered with a treating-robe, of which garments the practitioner should keep a supply. They are made much like a lady's plain nightgown; but large and loose, so as to serve ladies of any size, and give ample room to work the electrodes under them. Her skirts should be dropped below the seat, so far that their bands shall lie across her lap.
Let us now suppose the machine to be working. We will take the B D current. Let it be of good medium strength. We regulate the strength by the quantity of fluid in the battery, so far as volume is concerned, and by means of the plunger as respects intensity. The electrodes should be dampened with warm water. Let the sponge-roll, positive cord; that is, the cord connected with the negative post, to another sponge-roll, to be held in the operator's right hand; or, what is better, attach it to a thin, flexible, metallic wristband, (brass is good, but metallic lace—such as is used in trimming regalia, is best), underlaid with wet muslin, and fastened around the right wrist. This brings the operator's hand into the circuit as the negative electrode or pole. Next, pass a moist, warm sponge all over the patient's back. Now, before the back becomes dry, press the points of two fingers firmly, yet not uncomfortably, upon the back of the neck at the base of the skull; thence move gradually downward, by frequent touches of the same firm but gentle character, keeping one finger on each side of the spinous processes, until the whole length of the spine has been, in this manner, passed over. If sharp pain or soreness be felt at any point, note that point; there is inflamed irritation there. Then return up to the right or left shoulder, and pass, in like manner, by frequent touches with one or two fingers, over all parts of the back on that side of the spine, down to the hips. Then, in the same way, examine the shoulder and back on the other side of the spine, noting, as before, every point, if there be any, where soreness and pain appear. After this, pass over the entire neck, then over the front parts of the thorax and abdomen, down to the pelvic bones, everywhere watching for soreness and pain. Next, go to the head. Wet the hair through to the scalp, (because dry hair is a bad conductor,) and change to a very soft B C current. Then go over all the head in the same manner as over the neck and trunk. Better reverse the poles on the head, by transposing the cords in the posts, so as to make the manipulating hand the positive pole. The head is, or ought to be, extremely sensitive. You need not do this, however, if the negative pole can be received on the head without discomfort, as it sometimes can be. Commence on the cerebrum, and then pass to the cerebellum.
If, in the examination of the spine, the practitioner finds it uncomfortable to bear in his fingers a current of sufficient strength to be distinctly felt in that part of the patient, he may use the side-sponge cup on the spine. But let him never use a current on another person which he does not first apply to his own nerves, so as to know its intensity. Indeed, if one prefer to use the side-sponge cup through the whole process, he can do so; although there is advantage in using the fingers, since, by their concentrated impressions, he is more sure to detect disease than by the broader face of the sponge cup.
☞Now, wherever there is found soreness or lancinating pain under the touch, it is sure that the part is preternaturally positive—more or less so, according to the degree of painful irritability. On the other hand, if there be found a part evincing much less than the usual sensibility found in the healthy corresponding part of other patients, it may safely be pronounced torpid or paralytic, more or less. It lacks sufficient electro-vitality—is improperly negative, and needs to be treated with the negative pole.