Schurig eventrated a pregnant bitch and her puppies lived in their membranes half an hour.

Wrisberg cites three observations of infants born closed in their membranes; one lived seven minutes; the other two nine minutes; all breathed when the membranes were cut and air admitted.

Willoughby recorded the history of a case which attracted much comment at the time.

It was the birth of twins enclosed in their secundines.

The sac was opened and, together with the afterbirth, was laid over some hot coals; there was, however, a happy issue, the children recovering and living.