Strangely enough, it is from the most scientific of these authorities that has emanated the most unscientific of all the theories upon the subject of the Origin of Man. This is now so evident, that the hour is rapidly approaching when the current teaching about the descent of man from an ape-like mammal will be regarded with less respect than the formation of Adam out of clay, and of Eve out of Adam's rib. For
It is evident, especially after the most fundamental principles of Darwinism, that an organized being cannot be a descendant of another whose development is in an inverse order to its own. Consequently, in accordance with these principles, man cannot be considered as the descendant of any simian type whatever.[1553]
Lucae's argument versus the Ape-theory, based on the different flexures of the bones constituting the axis of the skull in the cases of man and the anthropoids, is fairly discussed by Schmidt. He admits that:
The ape as he grows becomes more bestial; man ... more human—
and seems, indeed, to hesitate a moment before he passes on:
This flexure of the cranial axis may, therefore, still be emphasized as a human character, in contradistinction to the apes; the peculiar characteristic of an order can scarcely be elicited from it; and especially as to the doctrine of descent, this circumstance seems in no way decisive.[1554]
The writer is evidently not a little disquieted by his own argument. He assures us that it upsets any possibility of the present apes having been the progenitors of mankind. But does it not also negative the bare possibility of the man and the anthropoid having had a common—though, so far, an absolutely theoretical—ancestor?
Even “Natural Selection” itself is with every day more threatened. The deserters from the Darwinian camp are many, and those who were at one time its most ardent disciples are, owing to new discoveries, slowly but steadily preparing to turn over a new leaf. In the Journal of the Royal Microscopical Society for October, 1886, we may read as follows:
Physiological Selection.—Mr. G. J. Romanes finds certain difficulties in regarding natural selection as a theory for the origin of species, as it is rather a theory of the origin of adaptive structures. He proposes to replace it by what he calls physiological selection, or segregation of the fit. His view is based on the extreme sensitiveness of the reproductive system to small changes in the conditions of life, and he thinks that variations in the direction of greater or less sterility must frequently occur in wild species. If the variation be such that the reproductive system, while showing some degree of sterility with the parent form, continues to be fertile within the limits of the varietal form, the variation would neither be swamped by intercrossing nor die out on account of sterility. When a variation of this kind occurs, the physiological barrier must divide the species into two parts. The author, in fine, regards mutual sterility, not as one of the effects of specific differentiation, but as the cause of it.[1555]
An attempt is made to show the above to be a complement of, and sequence to, the Darwinian theory. This is a clumsy attempt at best. [pg 684] The public will soon be asked to believe that Mr. C. Dixon's Evolution without Natural Selection is also Darwinism—expanded, as the author certainly claims it to be!