_Schauta_, therefore, distinguishes a mechanical, an inflammatory, and a nervous form of dysmenorrhœa. Mechanical dysmenorrhœa is most frequently due to stenosis or flexion of the canal of the cervix in some part of its course from the internal to the external os, dependent upon malformation or flexion of the uterus, hyperplasia of the mucous membrane, chronic metritis, scarring resulting from operative procedures, uterine polypi, etc. In inflammatory dysmenorrhœa we have to do “either with an inflammatory process or with excessive tension of the intrapelvic organs, dependent upon abnormal distension of their blood vessels.” To the same category belong ovarian dysmenorrhœa, and dysmenorrhœa due to inflammatory changes in the Fallopian tubes and to pelvic peritonitis. In nervous dysmenorrhœa, no anatomical cause is apparent, but the uterine contractions normally occurring during menstruation, and the normal congestive distension of the intrapelvic organs at that period, become extremely painful, in consequence of a morbid increase in the sensibility of the nervous system. The influence of dysmenorrhœa on the general condition of the woman suffering from it is often a very potent one. The normal undulatory course of the bodily temperature—which as _Reinl_ has shown, undergoes a gradual rise until shortly before the appearance of the menstrual flow, gradually falls during menstruation, and continues to fall for a time after menstruation is over—undergoes a change in cases of dysmenorrhœa due to anteflexion of the uterus, parametritis, or salpingitis, inasmuch as in these cases the acme of the temperature curve is reached actually during menstruation and the decline of temperature comes, not at the commencement of the menstrual flow, but often only after the flow has ceased. The curve of blood pressure and the curve indicating the excretion of urea are similarly affected in these cases.