 This line of thought has been pursued further by Charles Travis under the name of ‘occasion-sensitivity’, i.e., ‘‘the fact that the same state of the world may require different answers on different occasions to the question of whether what was said in a given statement counts as true’’ (Travis (1981, 147), see also (1989, 255)), this being a recurring theme, see the papers collected in Part 1 of (Travis 2008)). Thus, Cook Wilson’s above examples, ‘That building is the Bodleian’ or ‘glass is elastic’, are genealogically related to what are commonly known as ‘Travis cases’, i.e., sentences used to make a true statement about an item in one occasion and a false one about the same item in another. (For examples of these, see Travis (1989, 18–19), (1997, 89), (2008, 26 &amp; 111–112).)