as follows:

Under all conditions, the matter of sex is determined in the egg-cell at
the moment of fertilization.

Under all conditions, the sex is determined by a struggle for the
mastery in the egg-cell, between the energy of that egg-cell and the
energy of the male spermatozoon. In a crisis, when the life of one of
the two seeds is trembling in the balance, one of them--through the
exertion of its "Latent Reserve Energy," dominates, and engenders a
child of the opposite sex. This reversal of the sex is in conformity
with the Law of the _Cross-Transmission of Sex_; that is, the mother is
represented in the male offspring and the father in the female,--this
being the normal expression of the Law of Cross-Transmission of
Characteristics.

The "Latent Reserve Energy" is provided by nature for the "Preservation
of Species," and through this provision an impulsive, vehement energy
can, at the final moment of a crisis, be called upon for the salvation
of its kind.

A _seeming_ exception to this is due to the "Law of the Dominant" which
overrides the action of "Latent Reserve Energy," and is a provision of
nature for the preservation of the "Dominant," which is the most
prominent quality in nature.

When the subject is properly understood, this _seeming_ exception will
also become clear.

In the natural course, the study of heredity leads to the understanding