Also experience shows that these quite regular faces indicate as a rule only an inwardly mediocre human being; presumably if one may assume that nature in its external form expresses the proportions of the inner because, where none of the mental qualities exceed the proportion requisite to constitute an individual free from faults, nothing can be expected in the way of what is called genius, in which nature seems to make a departure from its usual relations of the mental powers in favour of some special one.