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closely preceded the first abnormal radiograph.It will be appreciated that for some cases the starting-point, thus defined, may be a considerable time after the true, but unknown, date of onset of the disease.Of the 52 cases, 29 had been discovered by the periodic M.R.C. radiographic examinations and 23 by the National Health Service (the latter including six as a result of a routine radiographic examination).Having completed the assessments, the special assessor was told the results of the tuberculin tests and the vaccination status for each patient, to discover whether the withholding of this information had seriously hampered him in making the assess- ments.With this extra information he would have regarded one of the 52 cases of sarcoidosis as primary tuberculosis, and three of the cases of possible sarcoidosis as definite sarcoidosis, BRITISH
Sutherland et al. (Sat,) studied this question.
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