In the strikingly evolutionary programs of the twentieth century, no group of individuals is about to have its old-time relationships more radically changed than the group of physicians. Many factors, social and economic, will be responsible. Some of these most evolutionary changes will promptly and voluntarily come from within the profession; others will be forced on the profession. It is evident that we have for all time passed beyond the stage of the absolutely individual and personal relationship of family physician and patient, to one in which the community steps in to safeguard itself against any abuse of this circumscribed relationship, and demands collective action in matters of health for the benefit of all.
SOCIAL AND ECONOMIC PROBLEMS
The concentration of population in cities has developed problems beyond the control of the private physician. In the trail of density of population have come the tenement, sweat-shop, bad housing and living