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Updated: June 12, 2025
As the cells of the reproductive organs are the only ones that pass over and into the next and later generations, it will be evident, in the first place, that the germ plasm of their nuclei is the only essential substance that connects parent and offspring.
So far as we know, each coming generation will inherit only qualities that the parents inherited from their parents. In short, acquired characteristics of the body tissues do not influence the germ plasm, the living matter concerned with heredity and reproduction, but the germ plasm that determines what the next generation will inherit is fixed at birth.
This germ plasm is handed on from generation to generation with all its variations, and hence the variations will be added permanently to the machine. Congenital variations are thus a means for permanently modifying the organism, and by their agency must we in large measure believe that evolution through the ages has taken place. With the acquired variations the matter stands quite differently.
A chink of light has been let in upon a dark cave, and slowly the chink will widen. But the gross effects are clear. Around the ovary and the uterus, the endocrines gyrate as the planets around the sun. The ovary is the organ for the preservation and maturation of the germ plasm, that treasure which the body is built but to cherish and hand on as a sacred heirloom.
It was the death fight in the darkness and that meant it was a savage, nightmare thing that called forth those most deep and terrible instincts that in the first days of the earth were stored and implanted in the germ plasm. These were no longer men of the twentieth century. They were simply beasts, fighting to the death in a cave.
Heredity was known to be a fact, and it was believed that while congenital characters are more commonly inherited, acquired characters may also frequently be handed down from generation to generation. The facts which we have noted of the continuity of germ plasm have during the last fifteen years led many biologists to deny the possibility of the latter.
Let us add that thought, too, propagates itself throughout mankind, in like manner with the germ plasm. Every thought, once expressed, leads in the human community a life independent of its creator; undergoes development in other minds; and has, like the germ plasm, an immortal life. So that, in humanity, there is neither true birth nor true death, whether material or spiritual.
It is impossible to explain in a mechanical way the power which directs the innumerable different chemical and physical processes within the organism, whether they be the bewilderingly purposeful reactions in the individual life of the cell, which seem to point to psychic processes within the plasm, or the riddles of development and of inheritance in particular; for how can a spermatozoon, so small that 500 millions can lie on a cubic line, be the bearer of all the peculiarities of the father to the son?
Climate, nourishment, etc., affect the inner structure, the plasm, transform it and thus produce variation which is transmitted to the progeny. But, however great may be the influence of environment, Eimer seems to overestimate it. Indeed, the analogy of "growth" should have led Eimer to a conception of the true relation between "internal" and "external" causes.
If acquired variations do not affect the germ plasm they cannot be inherited, and if the germ plasm is only a bit of protoplasmic substance handed down from generation to generation, we can not believe that acquired variations can influence it.
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