interest in psychology, especially as regards the theory of the
cell-soul, which I consider to be its chief foundation. The phenomena
we have described can only be understood and explained by ascribing a
certain lower degree of psychic activity to the sexual principles.
They FEEL each other's proximity, and are drawn together by a
SENSITIVE impulse (probably related to smell); they MOVE towards each
other, and do not rest until they fuse together. Physiologists may say
that it is only a question of a peculiar physico-chemical phenomenon,
and not a psychic action; but the two cannot be separated. Even the
psychic functions, in the strict sense of the word, are only complex
physical processes, or "psycho-physical" phenomena, which are
determined in all cases exclusively by the chemical composition of
their material substratum.

The monistic view of the matter becomes clear enough when we remember
the radical importance of impregnation as regards heredity. It is well
known that not only the most delicate bodily structures, but also the
subtlest traits of mind, are transmitted from the parents to the
children. In this the chromatic matter of the male nucleus is just as
important a vehicle as the large caryoplasmic substance of the female
nucleus; the one transmits the mental features of the father, and the
other those of the mother. The blending of the two parental nuclei
determines the individual psychic character of the child.

But there is another important psychological question--the most
important of all--that has been definitely answered by the recent
discoveries in connection with conception. This is the question of the
immortality of the soul. No fact throws more light on it and refutes
it more convincingly than the elementary process of conception that we
have described. For this copulation of the two sexual nuclei (Figures