I may be permitted to make some further observations regarding the nature of this atavistic reversion. There is not one single characteristic of the human anatomy which is not the product of inheritance. The existing type of the European mixed race appears to be a permanent type; or rather, owing to the fact that the struggle for existence of our time takes an almost exclusively economic form, and that in consequence of this the brain has received a preponderant importance, the present phase of human evolution affects the brain only (in women, unfortunately, as well as in men); if any other organ than the brain is influenced by selection in modern man, it is affected solely or mainly on account of its correlation with brain development. Naturally, future extensive changes in the size and shape of the brain will ultimately give rise to changes more or less extensive in neighbouring organs also, such as the bones of the skull, the teeth, the jaws, the external ear, and the upper cervical vertebræ. But for the brief period which the individual investigator has under his observation in the course of his life, the human species may approximately be regarded as a permanent type. Now our most enduring possessions in the way of bodily characteristics are inherited from very remote ancestors—they are atavisms. The great weight of the brain, the upright forehead, the large facial angle, peculiar to the European, have been inherited by him from his ancestors of the historic epoch; on the other hand, the number and shape of his teeth, the structure of his sense-organs, the arrangement of the fissures and convolutions of his cerebral cortex, the number and form of the mammary glands, the configuration of the upper limbs—these the European shares with the so-called anthropoid apes, with whom in other respects also he possesses a very close blood-relationship. Finally, the number of our fingers and toes, and the structure of the various tissues, as demonstrated by the microscope, are common to us and to the great majority of mammals; whilst innumerable other physical characteristics are shared by us with the lower vertebrata. Thus most of our bodily peculiarities are derived from our prehuman ancestors; they are atavisms, interesting antiquities. But if this be so, then the occasional appearance of one or two additional atavistic characters, whether these be derived from the men of the ice-age or from those of the tertiary period, or date back to the still undiscovered ape-men of a yet earlier day, or to the half-apes, or even to our remote fish-like progenitors, is hardly so incredible an occurrence as to demand that the thunderbolts of sterile anthropometry, so long carefully cherished by Virchow, should be launched against the heretic Lombroso.[10]