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Updated: May 14, 2025
After discussing mental traits observed in each sex which normally belong to the other, he concludes as follows: "If further evidence of this bisexuality, which exists in everyone, were required, it is to be found in the embryological remains of the latent sex, which always exist in the genital ducts." In some lower forms, dual sexuality is apparent until the animal is fairly well developed.
It is evident that the possession of any one of the above characteristics by a man approximates him more to the monkeys, so far as it goes. He retains features which have been obliterated in other persons in the process of evolution. In considering the physiognomy of man from an embryological standpoint, we must consider the peculiarities of the infant at birth. I. As to the General Form.
Further study, however, of the homologies of these peculiar appendages, and especially a knowledge of the embryological development of Lepisma and Machilis, is needed before this interesting point can be definitely settled. The three many jointed anal stylets may, however, be directly compared with the similar appendages of Perla and Ephemera.
Agassiz insists that ancient animals resemble to a certain extent the embryos of recent animals of the same classes; or that the geological succession of extinct forms is in some degree parallel to the embryological development of recent forms. I must follow Pictet and Huxley in thinking that the truth of this doctrine is very far from proved.
It is a particularly vigorous strain of seventeenth-century English embryological thought, well illustrated in the writings of that English man of affairs, Sir Kenelm Digby.
You are right again, if you view the matter only from an embryological or psychological standpoint. A child begins with deep sleep, then comes dream-sleep, and finally awakening, collecting, naming, adding, subtracting. What is that which awakens in the child? Is it a bone, or is it the soft mass which we call brain? Can the gray matter within our skulls give names, or add?
Did we want to make use once more of an embryological comparison, it would be necessary to look for it in the strange conceptions of ancient cosmogonies: they believed that from an earthly slime arose parts of bodies and separate organs which through a mysterious attraction and happy chance ended by sticking together, and forming living bodies.
Agassiz and several other highly competent judges insist that ancient animals resemble to a certain extent the embryos of recent animals belonging to the same classes; and that the geological succession of extinct forms is nearly parallel with the embryological development of existing forms. This view accords admirably well with our theory.
In its embryological development it passes through the long-tailed stage; connecting links in the Mesozoic also indicate that the younger type is the offshoot of the older. Insects evolve along diverse lines, giving rise to beetles, ants, bees, and flies. Brachiopods have dwindled greatly in the number of their species, while mollusks have correspondingly increased.
We are thus in a position to form a fairly complete idea of the past development of man's ancestors within the vertebrate stem by putting together and comparing the embryological developments of the various groups of vertebrates.
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