1. There is a double meaning here. In the first place, Dionysodorus is driving home thepoint about sameness and difference: if it is possible for something to be both same anddifferent, then Socrates, though different from a stone, might be the same as it. Secondly, heis simply calling Socrates stupid: stones were proverbially dense.

2. Reading ούκοûν… ού πατήρ έστιν with manuscript W. Notice the move from cases where the equation of ‘being different from’ and ‘not being’ is unexceptionable, to where it is exceptionable, the difference being that ‘father’ is an incomplete predicate, requiring qualification.