A group of coal-miners who had been certified as suffering from industrial dermatitis in the past has been reviewed. The object was to assess the degree of recovery and the effect of the skin trouble upon working capacity. A record was therefore prepared for each miner indicating (a) whether he had returned to his pre-dermatitis work ; (b) whether he had had any further spells of absence due to recurrence; (c) whether troublesome signs and symptoms persisted which required treatment by his general practitioner. Coal-miners fall naturally into three major occupational groups, namely, face workers, those employed elsewhere underground, and surface workers. These groups differ mainly in their place of work, the natural hazards to which they are exposed, and their rates of pay. It is inter esting to compare the course of dermatitis and the reaction of the individual to this disease in the three occupational groups. The initial incidence of the dermatitis and the pattern of its distribution on the skin differed between the three occupational groups. Subsequently, however, dermatitis in all three groups appeared to behave in a remarkably uniform manner. The significance of this uniformity in relation to the aetiology of dermatitis is discussed.