Consider first the average American household, where the family physician cannot call _every day_. Not a day finds this household without the need of information in medicine or hygiene or sanitation. More efforts of the profession are thwarted by ignorance than by epidemic. Not to supplant the doctor, but to supplement him, carefully prepared information should be at hand on the hygiene of health--sanitation, diet, exercise, clothing, baths, etc.; on the hygiene of disease--nursing and sick-room conduct, control of the nervous and insane, emergency resources, domestic remedies; above all, on the prevention of disease, emphasizing the folly of self-treatment; pointing out the danger of delay in seeking skilled medical advice with such troubles as cancer, where early recognition may bring permanent cure; showing the benefit of simple sanitary precautions, such as the experiment-stations method of exterminating the malaria-breeding mosquito. The volumes treating of these subjects cannot be made too clear, nontechnical, fundamental, or too well guarded by the supervision of medical men known favorably to the profession. Again, the physician cannot come _on time_ to save life, limb, or looks to the victim of many a serious accident. And yet some bystander could usually understand and apply plain rules for inducing respiration, applying a splint, giving an emetic, soothing a burn or the like, so as to safeguard the sufferer till the doctor's arrival--if only these plain rules were in such compact form that no office, store, or home in the land need be without them. Finally, the doctor _cannot come at all_ to hundreds of thousands of sailors, automobilists, and other travelers, to ranchers, miners, and country dwellers of many sorts. This third class has had, hitherto, little choice between some "Practice of Medicine," too technical to be helpful, on the one hand, and on the other, the dubious literature of unsanctioned "systems"; or the startling "cure-all" assertions emanating from many proprietors of remedies; or "Complete Family Physicians," which offer prescriptions as absurd for the layman as would be dynamite in the hands of a child, with superfluous and loathsome pictures appealing only to morbid curiosity, and with a general inaccuracy utterly out of touch with twentieth-century knowledge. What such people need, much more than the dwellers in settled communities, is to learn the views of modern medicine upon the treatment of the ever-present common ailments--the use of standard remedies, cautions against the abuse of narcotics, lessons of discrimination against harmful, useless, or expensive "patent medicines," and proper rules of conduct for diet, nursing, and general treatment.