 We know that Wittgenstein denied categorically that we could specify the possible forms of elementary propositions and the simples a priori (4.221, 5.553–5.5541, 5.5571). But he did not deny that these forms would be revealed as the result of logical analysis. In fact, he maintained precisely this view. This idea is not explicit in the Tractatus, but it is spelled out in a later self-critical remark from G. E. Moore’s notes of Wittgenstein’s 1933 lectures at Cambridge: 