Monogamy has a sentimental basis which is quite distinct from the political one of equal numbers of the sexes. Equal numbers in the sexes are quite compatible with a change of partners every day or every hour Physically there is nothing to distinguish human society from the farm-yard except that children are more troublesome and costly than chickens and calves, and that men and women are not so completely enslaved as farm stock. Accordingly, the people whose conception of marriage is a farm-yard or slave-quarter conception are always more or less in a panic lest the slightest relaxation of the marriage laws should utterly demoralize society; whilst those to whom marriage is a matter of more highly evolved sentiments and needs (sometimes said to be distinctively human, though birds and animals in a state of freedom evince them quite as touchingly as we) are much more liberal, knowing as they do that monogamy will take care of itself provided the parties are free enough, and that promiscuity is a product of slavery and not of liberty. The solid foundation of their confidence is the fact that the relationship set up by a comfortable marriage is so intimate and so persuasive of the whole life of the parties to it, that nobody has room in his or her life for more than one such relationship at a time. What is called a household of three is never really of three except in the sense that every household becomes a household of three when a child is born, and may in the same way become a household of four or fourteen if the union be fertile enough. Now no doubt the marriage tie means so little to some people that the addition to the household of half a dozen more wives or husbands would be as possible as the addition of half a dozen governesses or tutors or visitors or servants. A Sultan may have fifty wives as easily as he may have fifty dishes on his table, because in the English sense he has no wives at all; nor have his wives any husband: in short, he is not what we call a married man. And there are sultans and sultanas and seraglios existing in England under English forms. But when you come to the real modern marriage of sentiment, a relation is created which has never to my knowledge been shared by three persons except when all three have been extraordinarily fond of one another. Take for example the famous case of Nelson and Sir William and Lady Hamilton. The secret of this household of three was not only that both the husband and Nelson were devoted to Lady Hamilton, but that they were also apparently devoted to one another. When Hamilton died both Nelson and Emma seem to have been equally heartbroken. When there is a successful household of one man and two women the same unusual condition is fulfilled: the two women not only cannot live happily without the man but cannot live happily without each other. In every other case known to me, either from observation or record, the experiment is a hopeless