Book 3
5.37
There are some too who make questions of identity and difference come under the head of quality, others who place it under the head of definition. Posidonius Fr. p. 232, Bake. divides them into two classes, those concerned with words and those concerned with things. In the first case he thinks that the question is whether a word has any meaning; if so, what is its meaning, how many meanings has it, and how does it come to mean what it means? In the latter case, we employ conjecture, which he calls κατ᾽ αἴσθησιν, or inference from perception, quality, definition which he calls κατ᾽ ἔννοιαν, or rational inference, and relation. Hence also comes the division into things written and unwritten.
