from the father is wanting, the good quality of the brain coming from the mother, will at most produce a man of talent, a fine understanding, which the phlegmatic temperament thus introduced supports; but a phlegmatic genius is impossible. This condition coming from the father explains many faults of temperament described above. But, on the other hand, if this condition exists without the former, thus with an ordinarily or even badly constructed brain, it gives vivacity without mind, heat without light, hot-headed persons, men of unsupportable restlessness and petulance. That of two brothers only one has genius, and that one generally the elder, as, for example, in Kant's case, is primarily to be explained from the fact that the father was at the age of strength and passion only when he was begotten; although also the other condition originating with the mother may be spoiled by unfavourable circumstances.
I have further to add here a special remark on the childlike character of the genius, i.e., on a certain resemblance which exists between genius and the age of childhood. In childhood, as in the case of genius, the cerebral and nervous system decidedly preponderates, for its development hurries far in advance of that of the rest of the organism; so that already at the seventh year the brain has attained its full extension and mass. Therefore, Bichat says: "Dans l'enfance le système nerveux, comparé au musculaire, est proportionellement plus considérable que dans tous les âges suivans, tandis que par la suite, la pluspart des autres systèmes prédominent sur celui-ci. On sait que, pour bien voir les nerfs, on choisit toujours les enfans" (Le la vie et de la mort, art. 8, § 6). On the other hand, the development of the genital system begins latest, and irritability, reproduction, and genital function are in full force only at the age of manhood, and then, as a rule, they predominate over the brain function. Hence it is explicable that children, in general, are so sensible, reasonable, desirous of information, and teachable, nay, on the whole
