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Since, however, men and women have descended from remote ancestors who, in the manner of aquatic creatures, exercised functions of sperm-extrusion and germ-extrusion that were exactly analogous in the two sexes, without any specialized female uterine organization, the early stages of human male and female foetal development still display the comparatively undifferentiated sexual organization of those remote ancestors, and during the first months of foetal life it is practically impossible to tell by the inspection of the genital regions whether the embryo would have developed into a man or into a woman.
Preceding the forms of life which now exist, our observer would see animals and plants, not identical with them, but like them, increasing their differences with their antiquity and, at the same time, becoming simpler and simpler; until, finally, the world of life would present nothing but that undifferentiated protoplasmic matter which, so far as our present knowledge goes, is the common foundation of all vital activity.
Often enough faulty, it is the chief instrument by which man has become the leading figure on the world stage. No matter what happens in the outside world, be it something we see, hear or feel, in any sense-field there is an internal reverberation in our bodies, excitement. Excitement is the undifferentiated result of stimuli, whether these come from without or from within.
And yet, in his aesthetic rapture, the latter dwells with deliberation on his delights, and while luxuriating in the infinite labyrinths of beauty can scarcely be described as musing on an undifferentiated Unity. So far, at least, it does not appear that our formula applies to aesthetic feeling. Aesthetic feeling arises in the contemplation of a beautiful object.
The new-born infant is a spinal being, with an unformed diffluent brain, composed largely of water. Reflex life itself is not complete in him, and the cortico-motor system only hinted at; the sensory centers are undifferentiated, the associational systems remain isolated for a long time after birth. We have given above Flechsig's observation on this point.
This still undifferentiated tissue forming the base of the epidermis, and existing also as a source of renewal in internal organs, is the essentially living substance; and facts above given imply that it was the action of the medium on this essentially living substance, which, during early stages in the organization of the Metazoa, initiated that protective envelope which presently became an inherited structure a structure which, though now mainly inherited, still continues to be modifiable by its initiator.
Until reason is subtle and particular, the immediate struggle of politics will continue to require an amount of native wit, force, and unprovable faith, that reason can neither provide nor control, because the facts of life are too undifferentiated for its powers of understanding.
Preceding the forms of life which now exist, our observer would see animals and plants, not identical with them, but like them, increasing their differences with their antiquity and, at the same time, becoming simpler and simpler; until, finally, the world of life would present nothing but that undifferentiated protoplasmic matter which, so far as our present knowledge goes, is the common foundation of all vital activity.
He is quite confident that force and atoms will explain everything. He seems to mean force, pure and simple, without any intelligent direction; atoms, ultimate, homogeneous, undifferentiated.
In the living world, facts of this kind are now understood to mean evolution from a common prototype. It is difficult to imagine that in the not-living world they are devoid of significance. Is it not possible, nay probable that they may mean the evolution of our 'elements' from a primary undifferentiated form of matter?
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