The random nature of our proceedings may be illustrated from yet another side. There are a number of facts and principles, long since agreed upon as truly ascertained, which have never, or only very partially, been brought to bear upon custom and daily life. We all know that plenty of fresh air is a first condition of health and vigour; and are so far convinced of this verity that open-air treatment is generally accepted as the proper mode of attacking and mastering consumption. Yet we crowd together into cities: our houses are often very imperfectly ventilated, and our public buildings--churches, theatres, halls, schools and institutions, as well as our railway-carriages and tram-cars--provide only for the very minimum of change of air. Similar neglect of definitely ascertained facts may be seen in dress, in food and drink, in furniture, in occupations. Noise is well known to be injurious to the brain, and destructive to thought: more than that, it has been discovered that it is harmful to the viscera. We insist, more or less, upon quiet for the sick: but no trouble is taken about quiet for those who are well. Our thoroughfares echo with noises of all kinds, from the roar of traffic to the howling and whistling of errand-boys; and the authorities would be much surprised if they were accounted specially negligent for not making some effort to suppress them. Yet to any biologically trained person this noise must appear not disagreeable merely, but a real handicap to the health and energy of the community. Wherever faithfulness to scientific principle involves trouble without prospect of money-making, it is likely to be shirked, however great the benefits known to come from it. This is not entirely due to laziness, nor yet to ignorance, it is due quite as much to circumstance and to the pressure of our present social institutions. It is closely bound up with the great social question of the ownership of land, and with the husbandry and use of the resources of the land, our rivers and our sea-shore. Wasting a great measure of what these have to give us, polluting them in different ways by our manufactures and by the refuse of our cities, we are constraining whole masses of our population to look to the work and the products of other countries for the first necessities of life. Whole masses of our population are removed from direct contact with the soil, which is the nursing-mother not only of the body, but also of the mind of man; the people and the land being thus alike impoverished. Inquiring how so dangerous an error can have arisen, we may find at least part of its cause to lie in an ignorance of the fundamental principles of biology, the science of life. What, it may now be asked, is to be done to counteract these disadvantages and dangers? And, again, how does all this bear on the equipment of women?