The complete, or almost complete, absence from the Theaetetus of any unequivocal reference to Platonic Forms is a problem, the solution of which appeared to many scholars to have been found and convincingly presented in the late Professor Gornford's book Plato's Theory of Knowledge, published in 1935. Put briefly, his contention was that the main purpose of the dialogue is to show that no acceptable definition of knowledge can be reached if the Forms are left out of account, that there (...) are a number of passages in which any reader of the middle dialogues would see that they were deliberately being left out of account, and one or two, namely in the famous digression on the philosophic life, and in the discussion of ‘common terms’ , where they are actually brought in, though not indeed under the name of. (shrink)