Neuralgia of the kidney is spoken of by several writers, and I suppose there is no doubt that it may exist as a special neurotic disease with obvious organic cause. For my own part, I cannot say that I have ever seen it except in instances where there was either the certainty, or a very strong suspicion, that the cause was the mechanical pressure and irritation of a calculus within the kidney. The diagnosis of the simple functional disorder must be excessively perplexing; for in the first place there is the greatest difficulty in making sure that the pain is not external, and seated either in the muscles of the back, or in the superficial dorsal or lumbar nerves, and certainly I am strongly inclined to suspect that this has been really the case in many examples of so-called renal neuralgia. That neuralgia of the kidney may arise secondarily, as a reflex extension of pelvic neuralgia, does, however, appear probable enough; for it is almost certain that in the latter affection at least, the vaso-motor nerves of the kidneys must be strongly influenced in a reflex manner; since the crisis or acme of a paroxysm of pelvic pain is not unfrequently attended with a copious secretion of pale urine. Neuralgia of the rectum has been carefully described by Mr. Ashton, but is probably not often seen except by practitioners who possess special opportunities of observing rectal diseases. In the one pure case which has fallen under my notice the patient complained of acute paroxysmal cutting pains extending about one inch within the anus, and, as these were greatly increased by defecation I suspected the existence of fissure. Nothing of the kind, however, was found on examination; and the pain ultimately yielded to repeated subcutaneous injections of atropine. This patient had got wet through, and had sat in his damp clothes, getting thoroughly chilled; the pain came on with great suddenness and severity, and the tenderness which has been mentioned was developed very quickly. Probably the influence of cold and wet is among the commonest causes of the complaint. Mr. Ashton also reckons as causes, reflex irritation from other parts of the alimentary canal, and the influence of malaria. He observes that the subjects of the affection are most frequently anæmic, and of a generally excitable and deranged susceptibility, and that females, who, from menorrhagia, or frequent child-bearing with much hæmorrhage, have lost a great deal of blood, are specially predisposed.