Abstract

The paper contains two yet unknown letters that Feyerabend wrote to Kuhn in 1960 or 1961 on a draft of The Structure of Scientific Revolutions. In these letters, Feyerabend criticises both details of Kuhn's book and its general direction. The letters anticipate many of the arguments that were put forward in the public controversy against Kuhn's position, including some of the (numerous) misunderstandings. Feyerabend's assertions and arguments are very characteristic of his position in the early sixties