Popper wrote a 1956 Preface for The Postscript to The Logic of Scientitic Discovery: After Twentyfive Years. This appeared after almost 50 years in Realism and the Aim of Science (1983).
The Preface is the text of a talk titled “On the non-esistence of scientific method”.
“As a rule, I begin my lectures on Scientific Method by telling my students that scientific method does not exist. I add that I ought to know, having been for a time, the one and only professor of this non-existent subject within the British Commonwealth.”
There are several ways in which the subject does not exist.
