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.

It is a division into polarized duality, psychical and physical, of the human being.

It is the great vertical division of the egg-cell, and of the nature of man.
Then, this division having taken place, there is a new thrill of conjunction or collision between the divided nuclei, and at once the second birth takes place.

The two nuclei now split horizontally.