Because, given the key-notes of Tallness and Colour as Dominant traits, one identifies these, at once, as traits of Maleness; the greater stature of male creatures and the richer colour of their fur and plumage in the lower species pointing unmistakably thereto. Dwarfness (or lesser stature) and Whiteness (or lesser colour) are Recessive, and are obviously Female traits. The plant of Dominant type, though still bi-sexual, is making for a male _genus_; the Recessive type is making for a Female _genus_. White creatures are so feminine in general effect that it seems an anomaly when they are males. The converse is true of black creatures. The black horse is stubborn and restive; the white, gentle and submissive. White poultry are prolific in egg-production; white cattle are good milkers--a female characteristic. Jersey cows are both small in size and pale of colour. The male sex stands presumably for Dominance. And his positive, or objective, traits overpowering the negative, or subjective, traits of Recessiveness, prevail accordingly in early biological development. The female sex stands for Recessiveness. Her less assertive traits yield and recede into the background before those of the Dominant male. In stature, in strength, and in colour, and in the allied mental attributes, he holds the foreground in form and in function. The reason being that his rôle in Life is adaptation to environment. The male, therefore, in his masculine rôle of Adaptation, with his Dominant traits making fiercely for the survival and for the ever further development of physical fitness--until physical fitness, or Adaptation, had attained due degrees of ascendancy--was long lord of Creation; the female, his vassal. And this not only in life and in action, but too in the personal characteristics of both sexes. During æons before the Recessive female-traits were able to come into evidence as definite traits, they functioned as negations, merely; submerged and over-ridden in all female creatures by the Dominant male-traits they had inherited from their sires. Primal physical development may be said, thus, to have derived its first impulse from those fierce and fighting male-proclivities which characterised it in the epoch of that early savage struggle with environment whence Species emerged. Only with further evolutionary progress, do the female traits manifest as personal characteristics, secure survival, and find increasing exercise and sway.