It is to this tendency in the parents of men of genius, leading to a convergent heredity, that we must probably attribute the undue tendency of the men of genius themselves to manifest insanity. Each of the parents separately may have displayed but a minor degree of neuropathic abnormality, but the two strains were fortified by union and the tendency to insanity became more manifest. This was, for instance, the case as regards Charles Lamb. The nervous abnormality of the parents in this case was less profound than that of the children, but it was present in both. Under such circumstances what is called the law of anticipation comes into play; the neurotic tendency of the parents, increased by union, is also antedated, so that definite insanity occurs earlier in the life of the child than, if it had appeared at all, it occurred in the life of the parent. Lamb's father only became weak-minded in old age, but since the mother also had a mentally abnormal strain, Lamb himself had an attack of insanity early in life, and his sister was liable to recurrent insanity during a great part of her life. Notwithstanding, however, the influence of this convergent heredity, it is found that the total insanity of British men and women of genius is not more, so far as can be ascertained--even when slight and dubious cases are included--than 4.2 per cent. That ascertainable proportion must be somewhat below the real proportion, but in any case it scarcely suggests that insanity is an essential factor of genius. Let us, however, go beyond the limits of British genius, and consider the evidence more freely. There is, for instance, Tasso, who was undoubtedly insane for a good part of his life, and has been much studied by the pathologists. De-Gaudenzi, who has written one of the best psychopathological studies of Tasso, shows clearly that his father, Bernardo, was a man of high intelligence, of great emotional sensibility, with a tendency to melancholy as well as a mystical idealism, of somewhat weak character, and prone to invoke Divine aid in the slightest difficulty. It was a temperament that might be considered a little morbid, outside a monastery, but it was not insane, nor is there any known insanity among his near relations. This man's wife, Porzia, Tasso's mother, arouses the enthusiasm of all who ever mention her, as a creature of angelic perfection. No insanity here either, but something of the same undue sensitiveness and melancholy as in the father, the same absence of the coarser and more robust virtues. Moreover, she belonged to a family by no means so angelic as herself, not insane, but abnormal--malevolent, cruel, avaricious, almost criminal. The most scrupulous modern alienist would hesitate to deprive either Bernardo or Porzia of the right to parenthood. Yet, as we know, the son born of this union was not only a world-famous poet, but an exceedingly unhappy, abnormal, and insane man.