250 patients with dermatitis, and two groups of 70 and 30 healthy subjects were tested for their reactions to irritants following the procedures of Bjornberg. The same group of irritants was used. Although the test subjects were working in different conditions and the methods for evaluating the results were slightly different. Bjornberg's important conclusion “that it is not possible to predict the strength of the reaction to one irritant by knowing the strength of the reaction to another irritant” was confirmed.