  At a colloquium on modal and many-valued logics held in Helsinki, in 1962, Hintikka proposed a tense-logical construal of his possible worlds semantics, maintaining that ‘if we do not want to tie our logic to old-fashioned physics, we are undoubtedly wiser if we … no longer require that the alternativeness relation (in this case it could perhaps be more appropriately termed “futurity relation”) effect a linear ordering’ (1963: 76). Prior had happily tied his 1954 \(l\)-relation to ‘old-fashioned physics’: he later made it clear that he did not think much of the view of time embodied in twentieth century physics (1996b: 49–51).