Few animals, except the female of the human species, receive the male when pregnant. In only one or two species, and no more, does superfœtation ever take place.[982] Cases are to be found stated in the journals of physicians, and of others who have paid particular attention to the subject, in which twelve embryos[983] have been removed at a single abortion. When, however, but a very short time has intervened between two conceptions, the embryos both of them proceed to maturity; as was seen to be the case with Hercules and his brother Iphicles.[984] This was the case also with the woman who brought forth two children at a birth, one of whom bore a resemblance to her husband, and the other to her paramour. So too, with a female slave in Proconnesus,[985] who was delivered of two children at one birth, one of whom bore a strong resemblance to her master, and the other to her master’s steward, with both of whom she had had connection on the same day; with another woman who was delivered of two children at a birth, the one after the usual period of gestation, the other an embryo only five months old: and again, with another female, who, having been delivered of one child at the end of seven months, in due course, two months afterwards, brought forth twins.[986] CHAP. 10.—STRIKING INSTANCES OF RESEMBLANCE. It is universally known that well-formed parents often produce defective children; and on the other hand, defective parents children who are well formed, or else imperfect in the same part of the body as the parents. It is a well-known fact also, that marks, moles, and even scars, are reproduced in members of the same family in successive generations. The mark which the Daci make on their arms for the purpose of denoting their origin, is known to last even to the fourth generation.[987] (12.) We have heard it stated that three members of the family of the Lepidi have been born, though not in an uninterrupted succession, with one of the eyes covered with a membrane.[988] We observe, too, that some children strongly resemble their grandfather, and that of twins one child is like the father, while the other resembles the mother; and have known cases where a child that was born a year after another, resembled him as exactly as though they had been twins. Some women have children like themselves, some like their husband, while others again bear children who resemble neither the one nor the other. In some cases the female children resemble the father, and the males the mother. The case of Nicæus, the celebrated wrestler of Byzantium, is a well-known and undoubted instance. His mother was the produce of an act of adultery, committed with a male of Æthiopia; and although she herself differed in no way from the ordinary complexion of other females, he was born with all the swarthy complexion of his Æthiopian grandfather.[989]