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. Pignot speaks of one twin two months before the other. De Bosch speaks of a delay of seventeen days; and there were 2 cases on record in France in the last century, one of which was delayed ten days, and the other showed an interval of seven weeks between the delivery of the twins. There is an old case on record in which there was an interval of six weeks between deliveries; Jansen gives an account of three births in ten months; Pinart mentions a case with an interval of ten days; Thilenius, one of thirteen days; and Ephemerides, one of one week. Wildberg describes a case in which one twin was born two months after the other, and there was no secretion of milk until after the second birth. A full description of Wildberg's case is given in another journal in brief, as follows: A woman, eighteen months married, was in labor in the eighth month of pregnancy. She gave birth to a child, which, though not fully matured, lived. There was no milk-secretion in her breasts, and she could distinctly feel the movements of another child; her abdomen increased in size. After two months she had another labor, and a fully developed and strong child was born, much heavier than the first. On the third day after, the breasts became enlarged, and she experienced considerable fever. It was noticeable in this case that a placenta was discharged a quarter of an hour after the first birth. Irvine relates an instance of thirty-two days' delay; and Pfau one of seven days'. Carson cites the instance of a noblewoman of forty, the mother of four children, who was taken ill about two weeks before confinement was expected, and was easily delivered of a male child, which seemed well formed, with perfect nails, but weakly. After the birth the mother never became healthy or natural in appearance. She was supposed to be dying of dropsy, but after forty-four days the mystery was cleared by the birth of a fine, well-grown, and healthy daughter. Both mother and child did well.