To illustrate, we will take the lower limb, whether there is lameness, soreness, gouty, rheumatic, neuralgic, swollen, shrunken, feverish, cold, smooth and glassy, sores, ulcers, erysipelas, milkleg, varicose veins, or any defect that the patient may complain of, who is the only reliable book or being of symptomatology. For convenience we will divide that lower limb into five parts, the foot, leg, thigh, pelvis and lumbar region. The patient (symptomatologist) tells us he has a pain in front, center and under part of foot. Now the doctor or bird dog, can find quails of reason in but one field that would lead him to the cause. As this field is divided into five parts and the hunter has carefully searched four divisions, he will find the cause or causes in the fifth and none other. If a dislocated bone is not found in the foot after ascertaining that there has been no crushing by falling bodies, horses feet, stepping on glass, nails and other things that would penetrate the foot, and irritate by being broken off, closed and remaining in the flesh; we will explore the leg for the quail, ascertain if the articulation is normal at ankle and knee. If we find the bone is not broken, the leg has no splinters of wood, nor injured flesh by bites from dogs or other animals, nor any other substance that would injure the leg, we are prepared to pass on and explore another place for pain in the foot. We go on to division No. 3 or the thigh division, and ascertain if the thigh is normal in all conditions, properly in socket, with all muscles, ligaments and nerves unoppressed. There are but two more divisions left for exploration, and they are the most important and interesting of the five, the pelvis and lumbar, through which all the nerves of the limb pass. We must stop at pelvis and observe carefully that there is no twist of ligaments before going to lumbar, which is the last of the five divisions. If we have found nothing in the previous four, and have explored them as carefully as we should, we have but one brush heap left, and that one contains the quail that we have been hunting for. As the lumbar contains and conveys all nerve forces to the pelvis from the brain and all divisions of the lower limbs, we will now examine the articulations of that part of the spine, and in that we are very certain to find the cause if we have made no mistake in our examination in the preceding divisions of the limb. As we enter the exploration of this part of the spine we must remember that we are about to deal with the many divisions of the nerves of the _cauda equina_. The great question before us, comes after this form. What would wound or bruise any division of nerves that would lead by the way of the great or lesser sciatic, to a bone in the front and under side of the foot? Jars, strains, twists, and dislocations, must be carefully searched for. A partial dislocation of one side of the spine would produce a twist which