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Updated: June 26, 2025
And it remains central in the adult human body as it was in the egg-cell. In the adult human body the first nucleus of independence, first-born from the great original nucleus of our conception, lies always established in the lumbar ganglion. Here we have our positive center of independence, in a multifarious universe.
Any one can subscribe to these statements; in truth they contain something totally different from the "biogenetic principle"; for Haeckel has really no interest in so general a truth, but is intent only upon a proof of Descent. Hertwig continues: "In order to make our train of thought clear, let us take the egg-cell.
From the perfect oneing of the two parent nuclei in the egg-cell results a recoil or new assertion. That which was perfect one now divides again, and in the recoil becomes again two. This second nucleus, the nucleus born of recoil, is the nuclear origin of all the great nuclei of the voluntary system, which are the nuclei of assertive individualism.
Their psychic and their physical dynamic is the same in the solar plexus and lumbar ganglion as in the two nuclei of the egg-cell. The first great division in the egg remains always the same, the unchanging great division in the psychic and the physical structure; the unchanging great division in knowledge and function.
They go on multiplying, take up water, and nourish themselves on the granular nutritive matter present from the first in the egg-cell. The little mass elongates, increases in size, and gradually assumes the form of a young tadpole.
The real question of morality involved in the problem of contraconception is not whether it is immoral that sperm-cells should be prevented from swimming on towards an egg-cell, but whether there is morality in a sexual union that has its meaning only in affection and is not definitely intended for propagation.
We have here evidently a process corresponding to the fertilization of the egg in higher animals; yet there is no egg, spermatozoon, or sex. It is a little mass of protoplasm containing a nucleus, and corresponds, therefore, to one of the cells, most closely to the egg-cell or spermatozoon of higher animals.
Delages of Paris, and Loeb of California, have made valuable studies on these eggs. These chemicals appear to act on the delicate pellicle which forms the surface of the egg-cell in much the same way as the prick of a needle acts on a frog's egg.
So, in the first division of the egg-cell is set up the first plane of psychic and physical life, remaining radically the same throughout the whole existence of the individual. The two original nuclei of the egg-cell remain the same two original nuclei within the corpus of the adult individual.
There is a horizontal division across the whole egg-cell, and the nuclei are now four, two above, and two below. But those below retain their original nature, those above are new in nature. And those above correspond again to those below. In the developed child, the great horizontal division of the egg-cell, resulting in four nuclei, this remains the same.
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