Although the uterus does not receive the ovum into its cavity as it does in natural conception, it nevertheless undergoes many of those changes which are known to take place in regular pregnancy. The layer of coagulable lymph, which is effused upon its internal surface, and which forms the membrana decidua of Hunter, is present, and the uterus undergoes a slight increase of volume. As the ovum increases, excruciating pains are felt in the lower part of the abdomen, coming on at irregular intervals, and of irregular duration; in some cases lasting for a short time, in others continuing for twenty-four hours. These attacks of pain are generally accompanied with very painful forcing and tenesmus, and not unfrequently with a discharge of bloody mucus from the vagina. In tubarian pregnancy, however, the case generally follows a much shorter course: the patient is suddenly seized with an acute pain in the lower part of the abdomen, followed by nausea and vomiting; she becomes faint and weak; the abdomen evidently increases in size (from effusion of blood into the cavity;) the debility becomes more alarming, and death quickly follows. In ovarian pregnancy the fatal termination is merely postponed till a later period, during which the patient has to undergo attacks of most terrible suffering: at length, after a paroxysm more than usually severe, and frequently attended with the sensation of something giving way in the abdomen, faintings come on, speedily followed by death. During the attacks there is obstinate constipation, which is attended with painful and fruitless efforts to evacuate the bladder and rectum; the face is pale, and expressive not only of the most acute suffering, but of great anxiety and mental depression; nevertheless, in the intervals of the attacks she feels easy, and appears well and cheerful. The termination of a ventral pregnancy is very different; after a time the foetus dies, and may either remain enclosed in the cyst for life, or it may be discharged in portions by means of an abscess, either through the intestines, uterus, vagina, or abdominal parietes. Cases have occurred where it has come away by the bladder; in the former case, where it is retained, it diminishes more or less in size, becomes hard and closely packed together, and, in some instances, encrusted with a layer of calcareous matter.