In cross-breeding, the conditions cease not only to be those of self-fertilising, but they cease, moreover, to be those of the close inbreeding of self-fertilisation. In the "hybrids" obtained by crossing the higher-vigoured male sex-cells of the "pure" Dominants with the higher-vitalised female sex-cells of the "pure" Recessives, the Dominants--because Dominance is prepotent for exterior characteristics--submerge the external traits of the Recessives, which are prepotent for vital and internal functioning. Such Dominants are a bi-sexual species in which the male is prepotent. And to be male, means that they have expended, in terms of structural development, a great proportion of the female Vital power inherent in them; thus masking the Recessive female traits in them, as regards exterior characteristics. But since reproductive power inheres in these Recessive traits, these traits are preserved in the sex-cells, equally with the Dominant traits. The plants being not only bi-sexual, but self-fertilising also, the sex-cells must obviously be bi-sexual too; in order to provide the organism with factors both of life and development. Every sex-cell is a hybrid cell, therefore; bearing both Dominant and Recessive traits. But, like their parents, in some, the Dominant, in others, the Recessive traits are prepotent. And the Dominant sex-cells mating with Dominants, the Recessives with Recessives, the original types of so-called "pure" Dominants and "pure" Recessives reappear in the third generation. V _Self-fertilising organism is a female organism with a male organism differentiated in it_ Because the female represents the Life-potential of species and the Vital potential of organisms, a self-fertilising plant or creature must be regarded as a female organism, with a male organism of Adaptation, or Differentiation, developed in it. This male organism energises both its developmental and its functioning power, and fertilises it; although the _potential_ of structure, of growth, of function and of reproduction are engendered in the female organism. The female is the root-stock or parent-stem of all species, therefore.