The appearances of lichen planus of the buccal mucous membrane are descriptionbed, and details are given of a case where malignant changes occurred upon lingual lichen planus. The mounting number of reports of malignant changeoccurring on a basis of buccal lichen planus suggests that earlier optimistic statements about the prognosis of this condition may have to be revised.
(Concluded from page 556) The hospital populations of the three teaching general hospitals of Johannesburg have been used for making a comparison between the European and African incidence of various diseases (Table 25). The authors have been on the senior staffs of these hospitals during the period of the survey and are satisfied that similar conditions of admissions, diagnostic routine, etc., prevail. The only previous comparison to which reference could be made was Strachan's (1934) based on the 3,851 postmortem examinations he had performed. Berman's work on malignant disease (1935) was handicapped by the fact that he used the non-European section of the General Hospital which could not at that time be considered comparable with the European section. There was gross overcrowding in the non-European wards, and therefore careful screening and selection of cases was unavoidable. Berrnan did not make a direct comparison of African with European incidence.