Abstract
It has long been known that in many cases continued pain referred to the course of the trunk of the sciatic nerve or to the field of distribution of its two main components, the common peroneal and tibial nerves, the pain may be due to extrinsic pressure by a neoplasm or an infiltration either within the pelvis or outside of it; that the pain at times is caused by a new growth within the spinal canal or by organic disease of the radicles beyond the cord proper; that it is sometimes consequent on disease of the lumbar segment of the spine, and that it may be due to inflammatory disease of the nerve itself, as manifested by those clinical signs on which one must rely, as elsewhere, for the recognition of such neuritis. By these signs is meant impairment of the motor power or disturbance of sensation, either superficial or

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