In the process of physical growth, as I feel myself compelled often to repeat, anthropoids constantly diverge further from the human organization. C. Vogt justly observes: “When we consider the principles of the modern theory of evolution, as it is applied to the history of development, we are met by the important fact that in every respect the young ape stands nearer to the human child than the adult ape does to the adult man. The original differences between the young creatures of both types are much slighter than in their adult condition: this assertion, made long since in my lectures on the human race, has received a striking confirmation from recent autopsies of young anthropoids which have died in the Zoological Gardens of Europe. In proportion to the age of the specimen, the characteristic differences in the form of the jaw, the cranial ridges, etc., become more evident. Both man and apes are developed from an embryonic condition, and from the period of childhood in a diverging or almost opposite direction into the final type of their species, yet even adult apes still retain in their whole organization features which correspond to those of the human child.”[134] Quenstedt also says: “However much _Homo sapiens_ is raised by his intelligence above all other animals, however important the physical differences are which divide him from apes, yet the scene of their existence in the world is by no means so wide that, as time goes on, the narrow limits between them may not approximate more closely.”[135] In these words the opinion I have already expressed is set forth, an opinion which continues to gain ground; namely, that man cannot have descended from any of the fossil species which have hitherto come to our notice, nor yet from any of the species of apes now extant. It is more probable “that both types have been produced from a common ground-form, which is still more strongly expressed in the structure of young specimens, because the age of childhood is less advanced” (Vogt). This supposed progenitor of our race is necessarily completely hypothetical, and all the attempts hitherto made to construct even a doubtful representation of its characteristics are based upon the trifling play of fancy. Darwin came to the conclusion that man has, at any rate, descended from a highly organized form. He goes on to say: