Pregnancy going to term with a successful delivery frequently follows the performance of ovariotomy with astonishing rapidity. Olier cites an instance of ovariotomy with a pregnancy of twins three months afterward, and accouchement at term of two well-developed boys. Polaillon speaks of a pregnancy consecutive to ovariotomy, the accouchement being normal at term. Crouch reports a case of successful parturition in a patient who had previously undergone ovariotomy by a large incision. Parsons mentions a case of twin pregnancy two years after ovariotomy attended with abnormal development of one of the children. Cutter speaks of a case in which a woman bore a child one year after the performance of ovariotomy, and Pippingskold of two cases of pregnancy after ovariotomy in which the stump as well as the remaining ovary were cauterized. Brown relates a similar instance with successful delivery. Bixby, Harding, Walker (1878-9), and Mears all report cases, and others are not at all rare. In the cases following shortly after operation, it has been suggested that they may be explained by the long retention of the ova in the uterus, deposited them prior to operation. In the presence of such facts one can but wonder if artificial fecundation of an ovum derived from another woman may ever be brought about in the uterus of a sterile woman! Conception Soon After a Preceding Pregnancy.--Conception sometimes follows birth (or abortion) with astonishing rapidity, and some women seem for a period of their lives either always pregnant or with infants at their breasts. This prolificity is often alluded to, and is not confined to the lower classes, as often stated, but is common even among the nobility. Illustrative of this, we have examples in some of the reigning families in Europe to-day. A peculiar instance is given by Sparkman in which a woman conceived just forty hours after abortion. Rice mentions the case of a woman who was confined with her first child, a boy, on July 31, 1870, and was again delivered of another child on June 4, 1871. She had become pregnant twenty-eight days after delivery. He also mentions another case of a Mrs. C., who, at the age of twenty-three, gave birth to a child on September 13, 1880, and bore a second child on July 2, 1881. She must have become pregnant twenty-one days after the delivery of her first child.