Woodson speaks of a case of twins, one of which was born enveloped in its secundines.
Van Bibber was called in great haste to see a patient in labor.

He reached the house in about fifteen minutes, and was told by the midwife, a woman of experience, that she had summoned him because of the expulsion from the womb of something the like of which she had never seen before.

She thought it must have been some variety of false conception, and had wrapped it up in some flannel.

It proved to be a fetus enclosed in its sac, with the placenta, all having been expelled together and intact.

He told the nurse to rupture the membranes, and the child, which had been in the unruptured sac for over twenty minutes, began to cry.