It is not impossible, and it appears, indeed, highly probable, that it has been this degeneration and parasitism on the part of the female which has set its limitation to the evolution of ants, creatures which, having reached a point of mental development in some respects almost as high as that of man, have yet become curiously and immovably arrested.

The whole question of sex-parasitism among the lower animals is one throwing suggestive and instructive side-lights on human social problems, but is too extensive to be here entered on.) Again and again in the history of the past, when among human creatures a certain stage of material civilisation has been reached, a curious tendency has manifested itself for the human female to become more or less parasitic; social conditions tend to rob her of all forms of active, conscious, social labour, and to reduce her, like the field-tick, to the passive exercise of her sex functions alone.

And the result of this parasitism has invariably been the decay in vitality and intelligence of the female, followed after a longer or shorter period by that of her male descendants and her entire society.
Nevertheless, in the history of the past the dangers of the sex-parasitism have never threatened more than a small section of the females of the human race, those exclusively of some comparatively small dominant race or class; the mass of women beneath them being still compelled to assume many forms of strenuous activity.

It is at the present day, and under the peculiar conditions of our modern civilisation, that for the first time sex-parasitism has become a danger, more or less remote, to the mass of civilised women, perhaps ultimately to all.
In the very early stages of human growth, the sexual parasitism and degeneration of the female formed no possible source of social danger.
Where the conditions of life rendered it inevitable that all the labour of a community should be performed by the members of that community for themselves, without the assistance of slaves or machinery, the tendency has always been rather to throw an excessive amount of social labour on the female.

Under no conditions, at no time, in no place, in the history of the world have the males of any period, of any nation, or of any class, shown the slightest inclination to allow their own females to become inactive or parasitic, so long as the actual muscular labour of feeding and clothing them would in that case have devolved upon themselves! The parasitism of the human female becomes a possibility only when a point in civilisation is reached (such as that which was attained in the ancient civilisations of Greece, Rome, Persia, Assyria, India, and such as today exists in many of the civilisations of the East, such as those of China and Turkey), when, owing to the extensive employment of the labour of slaves, or of subject races or classes, the dominant race or class has become so liberally supplied with the material goods of life, that mere physical toil on the part of its own female members has become unnecessary.