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.