  Prior’s discovery of Findlay’s footnote followed hard on the heels of another discovery. In 1949 he learned (from Geach’s review of Julius Weinberg’s Nicolaus of Autricourt: A Study in 14th Century Thought) that, for the scholastics, an expression like ‘Socrates is sitting down’—an example discussed by Aristotle—is complete, in the sense of being assertible as it is, and is true at certain times, false at others. Prior was more familiar with the view (still widespread today) that such an expression is incomplete until a time-reference is supplied, and hence that—despite the seeming naturalness of doing so—one cannot regard the expression as changing its truth-value with the passage of time. The ancient view, that this change in value can and does occur, was a crucial discovery for Prior. He wrote about it in The Craft, contrasting it with the modern view that ‘Socrates is sitting down’ is not a ‘complete proposition’ but rather a ‘movable part’ that occurs in many different complete propositions: ‘“Socrates is sitting down” is thought of, we might say, as a diary entry, with a date, hour, minute and second beside it, and this date, etc. is part of the “proposition”’ (1951: 98). (For more about Prior’s discussion of temporality in The Craft see Markoska-Cubrinovska 2017.)