In a therapeutical and statistical study of 197 psoriasis patients, the pure and combined Goeckerman and classic therapies were compared with regard to the length of therapy and the following free interval. There exists no difference between the pure forms of both therapies. The combined forms, however, necessitate a longer treatment. Additional medical treatment does not shorten the topical therapy. The length of therapy is not influenced by sex or age. In another part of the work further questions pertaining to the therapy and the clinic of psoriasis were examined.