The simple hereditary theory takes for granted the most astonishing proposition without any proof, that mental experience can be recorded in matters, that mental experience can be involved in matter. When I look at you in the lake of my mind there is a wave. That wave subsides, but it remains in fine form, as an impression. We understand a physical impression remaining in the body. But what proof is there for assuming that the mental impression can remain in the body, since the body goes to pieces? What carries it? Even granting it were possible for each mental impression to remain in the body, that every impression, beginning from the first man down to my father, was in my father's body, how could it be transmitted to me? Through the bioplasmic cell? How could that be? Because the father's body does not come to the child in toto. The same parents may have a number of children; then, from this theory of hereditary transmission, where the impression and the impressed (that is to say, material) are one, it rigorously follows that by the birth of every child the parents must lose a part of their own impressions, or, if the parents should transmit the whole of their impressions, then, after the birth of the first child, their minds would be a vacuum.