In the state of nature you find every creature living a precarious existence, incessantly beset by enemies; and the creature survives only so long as it keeps itself at the top of its form. The result is the maintenance of the type in its full perfection, and, under the competitive pressure, a gradual increase of its powers. Excepting when sudden eruptions of natural forces occur, every creature is perfectly provided with a set of instincts for all emergencies; it is in harmonious relationship to its environment, it knows how to do what it has to do, and even its fears and its pains serve for its protection. But now comes man and overthrows this state of nature, abolishes the competitive struggle, and changes at his own insolent will both his environment and his reaction thereto. Man's changes are, in the beginning, all along one line; they are for his own greater comfort, the avoidance of the inconveniences of nature and the stresses of the competitive struggle. In a state of nature there are no fat animals, but in civilization there are not merely fat animals, but fat men to eat the fat animals. In a state of nature no animal loafs very long; it has to go out and hunt its food again. But man, by his superior cunning, compels the animals to work for him, and also his fellow men. So he produces unlimited wealth for himself; not merely can he eat and drink and sleep all he wants, but he builds a whole elaborate set of laws and moral customs and religious codes about this power, he invents manners and customs and literatures and arts, expressive of his superiority to nature and to his fellow men, and of his ability to enslave and exploit them. So he destroys for his imperious self the beneficent guardianship which nature had maintained over him; he develops a thousand complicated diseases, a thousand monstrous abnormalities of body and mind and spirit. And each one of these diseases and abnormalities is a new life of its own; it develops a body of knowledge, a science, and perhaps an art; it becomes the means of life, the environment and the determining destiny of thousands, perhaps millions, of human beings. So continues the growth of the colossal structure which we call civilization--in part still healthy and progressive, but in part as foul and deadly as a gigantic cancer. What is to be done about this cancer? First of all, it must be diagnosed, the extent of it precisely mapped out and the causes of it determined. Man, the rebel, has rejected his mother nature, and has lost and for the most part forgotten the instincts with which she provided him. He has destroyed the environment which, however harsh to the individual, was beneficent to the race, and has set up in the place of it a gigantic pleasure-house, with talking machines and moving pictures and soda fountains and manicure parlors and "gents' furnishing establishments."