Vallin Jacques. Morbidity in the Paris Region : The Contributions to its Study made by Statistics from the Central Primary Finance Office for Sickness Insurance. The study of morbidity has been difficult in the past, because rigorous and accurate data on sickness have been lacking. Many statistics have been collected as a by-product of administrative activities, but none have been wholly satisfactory for the demographer. Some of these sources, however, merit closer study, for instance, the information obtained on the occasion of medical examinations prescribed by Articles L286 and L293 of the Social Security Code, governing 'protracted illness'. This compulsory examination may become a source of systematic observations on certain categories...