If at this time we take the ovum, composed of all these different parts, out of the uterus; or, if we cut off the face of the uterus, and remove the decidua from the front of the membranes, we shall see at the upper part the placenta and membranes like an old fashioned watch, the placenta resembling the case, and the membranes (when the decidua is taken off) the glass of the watch[3]; then, at the lower part of the membranes, we see the remains or margins of the decidua reflexa, which has been removed to shew the chorion; whilst, still lower down, we observe the decidua externa, and the processes of the interna, filling up the cervix and inferior part of the body of the uterus, forming a kind of firm stalk to the globe above. This stalk is thick, so as to occupy all the lower part of the uterus; but the layers and processes, furnished by the different sides, do not adhere when they meet in the axis of the uterus; but we have always a small canal or perforation leading up in the axes of the uterus from the cervical efflorescence, or the gelatinous plug, to the bottom of the decidua reflexa. In proportion as the membranes enlarge and elongate, the decidua reflexa gradually protrudes before them down this canal, until at last it reaches the bottom; or, in other words, the membranes come to occupy all the uterine cavity. _Of the Manner in which Abortion takes place._ The process of gestation may be stopped, even before the fœtus, or vesicular part of the ovum, has descended into the uterus, and when only the primary vessels are formed. In this case, which occurs within three weeks after impregnation, the symptoms are much the same with those of menorrhagia. There is always a considerable, and often a copious discharge of blood, which coagulates or forms clots. This is accompanied with marks of uterine irritation, such as pain in the back and loins, frequently spasmodic affections of the bowels, and occasionally a slight febrile state of the system. In plethoric habits, and when abortion proceeds from over-action, or hemorrhagic action of the uterine vessels, the fever is idiopathic, and precedes the discharge.