In addition to case finding, a community-wide survey provides a base line for statistical proof of disease incidence, and thus an accurate measure for the needs of a community for public health staff, sanitariums, and hospital accommodations. A repetition of the survey after a definite time interval would provide reasonably accurate knowledge as to the proficiency of preventive measures and an approximation of the attack rate. It is interesting to note the practicability of a community-wide chest survey program hinged on the demonstration that efficient chest film readings can be accomplished in fully clothed patients. The conclusions formed from the original investigative work on this simplified procedure have been amply proved in the large surveys already undertaken. The approval of organized medicine in a community is a basic requirement before the United States Public Health Service will lend its aid to mass chest survey projects. The physicians in each of the communities so far covered have had impor...