Amenorrhœa is especially apt to induce cardiac disorder in cases in which, in consequence of some sudden impression, such as a fright or a severe chill, menstruation, which began at puberty in normal fashion and subsequently recurred with perfect regularity, has undergone sudden and complete suppression; also in cases in which severe anæmia or obesity has rapidly led to the onset of amenorrhœa. In such cases, attacks of tachycardia sometimes occur, it may be at irregular intervals, or it may be exhibiting a menstrual rhythm, the cardiac affection manifesting itself always a few days before the date at which menstruation ought to begin. In these cases, also, systolic murmurs are not infrequently audible. In cases in which menstruation is very painful, the dysmenorrhœa may give rise to attacks of colic or to convulsive seizures, whether the dysmenorrhœa is itself due to inadequacy or to complete suppression of the flow, to metritis, to anteflexion, to new growths in the uterus, or, finally, to diseases of the ovaries or to pathological disorders of ovulation. Among the various disorders associated with dysmenorrhœa, heart troubles are not infrequent, most often taking the form of reflex neuroses, evoked by the stimulus of the pain in the genital organs; but it has also been asserted that an acute dilatation of the heart occurs in these attacks. Very threatening cardiac symptoms as an accompaniment of severe dysmenorrhœa have been seen by me especially in the case of two women, one of whom was in the thirties and the other in the forties. The attacks took the form of increased frequency of the heart’s action, with severe cardiac dyspnœa on trifling exertion, sense of suffocation, and intense anxiety. This severe cardiac and respiratory distress was a sequel to the appearance of severe dysmenorrhœa, and was relieved as soon as the course of menstruation became regular and painless; but the cardiac trouble recurred in association with each successive attack of dysmenorrhœa. In one of these two women, the dysmenorrhœa was the result of extreme anteflexion of the uterus; in the other woman, the cause of the dysmenorrhœa was not apparent. I was unable to decide with certainty whether in these cases an acute dilatation of the heart occurred. French authorities, who describe similar cardiac trouble resulting from diseases of the liver and the stomach by the name of _asystolic gastrohépatique_ (_Potain_), give the following explanation of its mode of occurrence. The intra-abdominal plexus of the sympathetic is stimulated, this stimulus is reflected to the lungs, in which organs it gives rise to vaso-constriction, resulting in increased tension in the lesser circulation; in consequence of this the right heart has difficulty in emptying itself, when weak it undergoes dilatation, and a moderate or extreme tricuspid insufficiency ensues. We have to do, then, in these cases, with reflex symptoms, with a reflex arc, the starting