The machinery for preventing these evils is discussed in Chapter XXIX. Suffice it here to present to parents and teachers the need for examination in advance of certification that will show whether or not those who make a livelihood by caring for others' health are equipped to mitigate rather than aggravate evils, and for further tests by which the public can learn from time to time which, among those professional men who are protected by the public against competition, continue to be safe. Finally, if, as will be clearly seen, it is desirable that what we call professional ethics persist and that self-advertisement be discouraged, society must, for its own protection, adopt some other means than epithets to correct the evils of self-advertisement and quackery. Even though we admit the responsibility of each citizen when he goes to the house of a private practitioner who has made no other effort to lure him thither than to place a card in the window, it must be seen that we cannot hold responsible for their choice men and women who receive through newspapers, magazines, or circulars convincing notices that Dr. So-and-So or the Integrity Company or the Peerless Dental Parlor will place at their disposal, at prices within their reach, skill and devotion absolutely beyond their reach at the office of an efficient private practitioner. Some way must be found by which departments of health will currently impose tests of methods and results upon physicians, opticians, pharmacists, manufacturers of medicine, and dentists. As laymen become more intelligent regarding their own bodies and healthy living, it grows harder and harder for quacks and incompetents to mislead and exploit them. Better than any possible outside safeguard is hygienic living. Fortunately, we can all learn the simple tests of environment and of living necessary to the selection of physicians, dentists, and opticians, or other "architects of health" whose efficiency and integrity are beyond question. PART IV. OFFICIAL MACHINERY FOR ENFORCING HEALTH RIGHTS CHAPTER XXVII DEPARTMENTS OF SCHOOL HYGIENE