This paper explores Thomas Kuhn’s intellectual history by examining sources that have been understudied so far: the Lowell Lectures of 1951 (The Quest for Physical Theory) and the hitherto unpublished Notre Dame Lectures of 1980. The analysis of these texts aims to reconstruct Kuhn’s development of a semantics that can account for scientific progress. This analysis will show that the alleged “linguistic turn” attributed to the author is actually a renewed interest in problems that existed well before publishing The Structure (...) of Scientific Revolutions. (shrink)