The great advantage of having cases of phthisis notified is not only that each notification enables personal preventive measures to be taken against infection, but also that each case becomes the point d'appui for the detection of other hitherto unrecognised cases. In local experience in Brighton, people have secured in addition, under a voluntary system, the notification of a considerable proportion of cases of phthisis among persons above the wage-earning classes. In England the voluntary notification of cases of phthisis was begun in January 1899 in Brighton, and in September 1899 in Manchester, and since then a considerable number of other towns has adopted it, with very varying success. The chief reason for the success of voluntary notification of phthisis in Brighton has been the provision for the sanatorium treatment of notified cases. In Sheffield compulsory notification of phthisis has been adopted under a special local Act.