The modern history of this operation is quite interesting, and is very completely reviewed by Hirst and Dorland.
In November, 1893, Hirst reported 212 operations since 1887, with a maternal mortality of 12.73 per cent and a fetal mortality of 28 per cent.

In his later statistics Morisani gives 55 cases with 2 maternal deaths and 1 infantile death, while Zweifel reports 14 cases from the Leipzig clinic with no maternal death and 2 fetal deaths, 1 from asphyxia and 1 from pneumonia, two days after birth.

All the modern statistics are correspondingly encouraging.
Irwin reports a case in which the firm attachment of the fetal head to the uterine parietes rendered delivery without artificial aid impossible, and it was necessary to perform craniotomy.

The right temporal region of the child adhered to the internal surface of the neck of the uterus, being connected by membranes.

The woman was forty-four years old, and the child was her fourth.
Delay in the Birth of the Second Twin .-- In twin pregnancies there is sometimes a delay of many days in the birth of a second child, even to such an extent as to give suspicion of superfetation.