There exists a kind of peculiar antipathy between the bodies of certain persons, which, though barren with respect to each other, are not so when united to others;[1004] such, for instance, was the case with Augustus and Livia.[1005] Certain individuals, again, both men and women, produce only females, others males; and, still more frequently, children of the two sexes alternately; the mother of the Gracchi, for instance, who had twelve children, and Agrippina, the mother of Germanicus, who had nine. Some women, again, are barren in their youth, while to others it is given to bring forth once only during their lives. Some women never go to their full time, or if, by dint of great care and the aid of medicine, they do give birth to a living child, it is mostly a girl. Among other instances of rare occurrence, is the case of Augustus, now deified, who, in the year in which he departed this life, witnessed the birth of M. Silanus,[1006] the grandson of his grand-daughter: having obtained the government of Asia, after his consulship, he was poisoned by Nero, on his accession to the throne. Q. Metellus Macedonicus,[1007] leaving six children, left eleven grandsons also, with daughters-in-law and sons-in-law,[1008] twenty-seven individuals in all, who addressed him by the name and title of father. In the records of the times of the Emperor Augustus, now deified, we find it stated that, in his twelfth consulship, Lucius Sylla being his colleague, on the third day before the ides of April,[1009] C. Crispinus Hilarus, a man of a respectable family of the plebeian order, living at Fæesulæ,[1010] came to the Capitol, to offer sacrifice, attended by eight children (of whom two were daughters), twenty-eight grandsons, nineteen great-grandsons, and eight granddaughters, who all followed him in a lengthened train. CHAP. 12. (14.)—AT WHAT AGE GENERATION CEASES. Women cease to bear children at their fiftieth year, and, with the greater part of them, the monthly discharge ceases at the age of forty. But with respect to the male sex, it is a well-known fact, that King Masinissa, when he was past his eighty-sixth year, had a son born to him, whom he named Metimanus,[1011] and that Cato the Censor, after he had completed his eightieth year, had a son by the daughter of his client, Salonius: a circumstance from which, while the descendants of his other sons were surnamed Liciniani, those of this son were called Saloniani, of whom Cato of Utica was one.[1012] It is equally well known, too, that L. Volusius Saturninus,[1013] who lately died while prefect of the city, had a son when he was past his seventy-second year,[1014] by Cornelia, a member of the family of the Scipios, Volusius Saturninus, who was afterwards consul. Among the lower classes of the people, we not uncommonly meet with men who become the fathers of children after the age of seventy-five. CHAP. 13. (15.)—REMARKABLE CIRCUMSTANCES CONNECTED WITH THE MENSTRUAL DISCHARGE.