“…(2) The severity ofboth diseases varies synchronously.-This has frequently been noted (Brunsting, 1943;Epstein, 1939;Garrod and Evans, 1924;Gibson, 1948;Graham, 1953;Hench, 1927Hench, , 1935Hunt, 1932;Jeghers and Robinson, 1937;Nordin, 1934;Nunemaker and Hartman, 1950;O'Leary, 1943;Vilanova and Pifiol, 1951), and it is considered by many to be essential to the diagnosis of "psoriatic arthritis". It has also been found that whereas treatment of the arthritis had no effect on either condition, treatment of the psoriasis relieved both (Franks and Wallace, 1942;Hench, 1935;Jungmann and Stem, 1944).…”