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The fetation was made by injecting the sporoblast into the blood stream with a hypodermic needle.

Many of the older writers mention this form of fetation as a curiosity, but offer no explanation as to its cause.

Argles mentions simultaneous extrauterine fetation and superfetation.

Sulikowski relates an instance of congenital fetation in the umbilicus of a girl of fourteen, who recovered after the removal of the anomaly.