According to the measurements of Kilian, the uterus in the virgin adult, varies in length from twenty-four to twenty-six lines; the greatest breadth is eighteen lines; the thickness nine lines; the cervix is from ten to twelve lines long; its breadth from six to eight; its thickness from five to six lines. The length of the uterine cavity is twelve lines, and its breadth nine lines. After one or more births all these measurements increase from one-fifth to one-quarter. The weight of the uterus varies from eight to twelve drachms, and may, after several pregnancies, amount to two ounces. =Congenital Anomalies.= The entire absence of the uterus is an exceedingly rare occurrence, and need not affect the health of the individual. A seeming multiplication of the organ is occasionally met in the _bilocular_ and _horned_ uterus. In the former, a more or less perfect septum extends through the organ in the median line, while in the latter, the uterus is divided into two lateral portions, by a prolongation of the angles or cornua, giving a resemblance thus to a permanent form seen in many of the lower animals.[35] We may also find the so-called _uterus unicornis_, where only one of the two rudimentary bodies from which the normal uterus is developed arrives at maturity. All these kinds of uteri are capable of becoming impregnated, but parturition, although not necessarily fatal, seriously endangers the life of the patient; owing, according to Rokitansky, partly to the want of the necessary dimensions of the part that undertakes the functions of the entire organ, and partly to the obstacle opposed to the uniform development of the impregnated half by the unimpregnated half. These circumstances favor rupture of the uterine walls. =Hypertrophy and Atrophy.= These are in part normal at the periods of puberty and change of life; as a morbid state, the first is of more frequent occurrence than the last. Either may affect the entire organ, or only a part. After the climacteric period the cervix often disappears entirely. =Hydrometra.= As the result of inflammatory processes, the os internum or the os externum may become occluded, causing a retention of the secretions from the diseased mucous membrane of the uterus. This secretion gradually changes into a sort of thin serum. The uterus becomes dilated, and we have hydrometra. _Hæmatometra_ is a condition where the uterus is dilated with serum mixed with blood, or exclusively with retained menstrual blood. This latter state is more frequently the result of congenital than of acquired atresia. The amount of dilatation may vary greatly. =Malpositions of the Uterus.= These may be of two kinds: (1) where the direction of the axis is changed; or (2) the organ becomes altogether displaced, so that its relation to all the pelvic viscera is altered. Of the former class, are ante- and retro-versions, with flexions, and lateral obliquities; of the latter, prolapsus procidentia and inversion.