When one considers the part which sexual attraction plays in the order of sentient life on the globe, from the almost unconscious attractions which draw amoeboid globule to amoeboid globule, on through the endless progressive forms of life; till in monogamous birds it expresses itself in song and complex courtship and sometimes in the life-long conjugal affection of mates; and which in the human race itself, passing through various forms, from the imperative but almost purely physical attraction of savage male and female for each other, till in the highly developed male and female it assumes its aesthetic and intellectual but not less imperative form, couching itself in the songs of poet, and the sometimes deathless fidelity of richly developed man and woman to each other, we find it not only everywhere, but forming the very groundwork on which is based sentient existence; never eradicable, though infinitely varied in its external forms of expression. When we consider that in the human world, from the battles and dances of savages to the intrigues and entertainments of modern Courts and palaces, the attraction of man and woman for each other has played an unending part; and, that the most fierce ascetic religious enthusiasm through the ages, the flagellations and starvations in endless nunneries and monasteries, have never been able to extirpate nor seriously to weaken for one moment the master dominance of this emotion; that the lowest and most brutal ignorance, and the highest intellectual culture leave mankind, equally, though in different forms, amenable to its mastery; that, whether in the brutal guffaw of sex laughter which rings across the drinking bars of our modern cities, and rises from the comfortable armchairs in fashionable clubs; or in the poet’s dreams, and the noblest conjugal relations of men and women linked together for life, it plays still today on earth the vast part it played when hoary monsters ploughed after each other through Silurian slime, and that still it forms as ever the warp on which in the loom of human life the web is woven, and runs as a thread never absent through every design and pattern which constitutes the individual existence on earth, it appears not merely as ineradicable; but it is inconceivable to suppose that that attraction of sex towards sex, which, with hunger and thirst, lie, as the triune instincts, at the base of animal life on earth, should ever be exterminable by the comparatively superficial changes resulting from the performance of this or that form of labour, or the little more or less of knowledge in one direction or another.