Atrophy of the uterus is a normal process after the menopause, but it sometimes occurs much earlier in life, and then causes scanty and irregular menstruation or amenorrhoea. Attention was first called to this condition by Simpson as a process sometimes following parturition under the name of super-involution. Several labors in rapid succession have been stated to be a cause, but Simpson and Courty both give a case after a single birth. Uterine atrophy may also result from the pressure of tumors, and it has been observed in paraplegias the result of defective innervation. The deranged menstruation is the one prominent symptom of this condition, and a diagnosis is to be made by exploration. The cervix is found small and the body light when lifted on the finger. Bimanual examination and the introduction of the sound will reveal the true condition of the organ. The latter process should be cautiously conducted on account of a frequent change of texture in the uterine walls which allows the instrument to pass through them with the use of but very little force. Amenorrhoea is physiological during nursing and pregnancy. The former needs no attention, the latter only in regard to diagnosis. A sudden cessation of menstruation, the patient presenting all the appearances of good health, should immediately excite suspicion as to the nature of the cause. It needs but little experience to distinguish and manage these cases in the lower social ranks. The case is different, however, in a family of good position, with an anxious mother urgent for active measures, where no suspicions will be tolerated and the imputation of possible pregnancy be warmly resented. Time is here the sure ally of the physician, and an examination should be deferred until such a period {187} has been reached that pregnancy can be positively negatived or determined. The influence of acute diseases in suppressing menstruation is not marked. During convalescence from them the flow frequently ceases from general debility. All chronic diseases depressing and exhausting in nature cause suppression, as albuminuria, cirrhosis, and cancer. Tuberculosis is as fruitful in interrupting the return as in preventing the appearance of the flow, and suppression from this cause is very frequent. Under impaired nutrition and depressed powers vital force is engaged wholly in maintaining existence; there is none for any function relating to the propagation of the species. In this class the disappearance is gradual; the flow becomes scanty and irregular in recurrence, and finally ceases. This form of amenorrhoea differs in no material point from the similar class already considered; it is but a symptom of disease of some vital organ or of some general abnormal condition.