It will be seen thus that, as in hybrid plants, so in hybrid creatures of both sexes, cells of two sexes are generated: in the male, cells Dominant for maleness and cells Recessive for maleness--female that is; in the female, Recessive cells, prepotent for femaleness, and Dominant, or male, cells. And of these, the Dominant male sex-cells contributed by the male parent, mating with the Dominant, or male, sex-cells contributed by the female parent, male offspring results. While the Recessive female sex-cells contributed by the female parent, mating with the Recessive, or female, sex-cells contributed by the male parent, female offspring results. Furthermore, Dominance being paramount in development, it must be from the Dominant inherence imparted by residence in a male organisation to the potential, or Recessive, female Germ-Plasm that the latter derives the new developmental impulse it transmits to sex-cells. While Recessiveness being Life and Faculty in the potential mode, it must be from the Recessive inherence engendered in the Dominant male Germ-Plasm, by residence in a female organisation, that its Dominance, passing into latency, derives a new potential of further evolutionary impetus. The differentiation of living creatures into two sexes, therefore, of bodies into two sides, of brains into two halves, and of Germ-Plasm into two reproductive glands, would seem to have had for object the ever further specialisation and segregation in the individual, for purposes alike of constitutional organisation and of the evolution of Faculty and Reproduction, of the two Orders of Contrasting Traits, which I have assumed to be Maleness and Femaleness, respectively. From this view-point, the female Sex and Sex-traits are Recessive, or Potential, always, on the material plane, and manifest increasingly thereon only by way of ever more complex alliances with male-traits; which, being positive on the concrete plane, equip the female inherences for function thereon. Femaleness, or Recessiveness, on its side, however--being Life-Energy in the potential--is all the while engendering new potence for Dominance to transform into active, or functioning, power. While although negative, it is equally potent, on _its_ side of the equation, to alter the values and manifestations of Dominance. Just as negative electricity inhibits the positive and destructive forces of positive electricity, although it does not, of itself, _manifest directly_. The Dominant traits of Tallness and Strength, for example, are direct and _positive_ factors in physical development. Dwarfness and Weakness are indirect and _negative_ factors therein. Nevertheless, degrees of Dwarfness or of Weakness must proportionally reduce and modify the tallness of Tallness or the power of Strength.