the others, and it forms a shallow gutter which extends to the ovary. The uterus, tubes, and ovaries lie in a septum which reaches across the pelvis from hip to hip. This septum is called the Broad Ligament. If a man's soft hat, of the style called "Fedora," is inverted, the fold along the crown coming up into the cavity of the hat is like the broad ligament. As the crown is held downward the uterus would be in the middle, its fundus upward, and outside the hat, representing the pelvic cavity, but in the crown fold. The tubes and ovaries would also be in the crown fold, or broad ligament, and the fimbriated extremities would open into the interior of the pelvic cavity through holes. The ovum breaks through the surface of the ovary into the pelvic cavity, passes, probably on a capillary layer of fluid, into the fimbria ovarica and thence into the infundibulum, whence it moves along slowly into the uterus. Ovulation and menstruation occur about the same time ordinarily, and if the ovum produced is not fecundated it gradually shrivels and passes off through the uterus and vagina. Fecundation of the ovum rarely occurs in the uterus, but ordinarily in the Fallopian tube. After fecundation the ovum is pushed on through the Fallopian tube into the uterus in from five to seven days, where it fastens to the wall and develops normally. Hyrtl described an ovum which appeared to reach the uterus in three days. If from some abnormal condition of the Fallopian tube the fecundated ovum is blocked and held in the tube, the embryo grows where the ovum stopped, and we have a case of Ectopic Gestation. In normal pregnancy in the uterus, the uterus grows with the embryo, but a tube does not. In the latter condition, when the ovum is big enough it bursts the tube or slips out through the ampulla, causing hemorrhage or other pathological symptoms. There are certain rare abnormalities of the uterus through imperfect embryological development, and pregnancy in such a uterus may result in symptoms like those of ectopic gestation. Normally the uterus and vagina are formed by the fusion of the two Müllerian ducts. When these ducts do not fuse perfectly, or when one develops partly, the various kinds of abnormal wombs and vaginas are the results. There may be a double uterus with a single or double vagina, a uterus with a complete or partial septum down the middle, a uterus with one horn, a uterus with a developed horn and a rudimentary horn, and the rudimentary horn may be open or shut, and so on. In many of these conditions the ovum becomes blocked and rupture follows as in ectopic gestation.