For a few months in 1907 New York City had a highly efficient commissioner of street cleaning, who, in spite of the unanimous protests and appeals of the press, refused to give up the practice of medicine. Hitherto the board of health of that city has been unable to obtain the full time of its physicians because professional standards give greater credit to the retail application of remedies than to the wholesale application of preventives. Statesmanship as well as professional ability is expected of physicians in the leading European cities, more particularly of those connected with health departments. There it is not felt that a medical degree is of itself a qualification for sanitary or health work. After the professional course, physicians must take courses in preventive hygiene and in health administration. Medical courses include such subjects as vital statistics, duties of medical officers of health, sanitary legislation, state medicine. The needless cost for one year of "catching" diseases in New York City would endow in perpetuity all the schools and lectureships and journals necessary to teach preventive hygiene in every section of this great country. That city alone sacrifices twenty-eight thousand lives annually to diseases that are officially called preventable. The yearly burial cost of these victims of professional and community neglect is more than a million dollars. When to the doctor bills, wages lost, burial cost of those who die are added the total doctor bills, wages lost, and other expenses of the sick who do not die, we find that one city loses in dollars and cents more every year from communicable diseases than is spent by the whole United States for hospitals and boards of health. Many diseases and much sickness are preventable that are not communicable. Indigestion due to bad teeth is not itself communicable, but it can be prevented. One's vitality may be sapped by irregular eating or too little sleep; others will not catch the trouble, although too often they imitate the harmful habits. Adenoids and defective vision are preventable, but not contagious. Spinal curvature and flat foot are unnecessary, but others cannot catch them. Preventive hygiene, however, should teach the physician's duty to educate his patient and his community regarding all controllable conditions that injure or promote the health.