Kuhn wrote the foreword to the 1979 edition of Fleck's book, noting that he read it in 1950 and was reassured that someone "saw in the history of science what I myself was finding there."
쿤은 1979년 플렉의 책 해설을 쓰면서 그 책을 1950년에 읽었으며 누군가가 "내가 발견해 낸 것을 과학의 역사에서 보았다"고 서술하였다.