  The passage between A106 and A111 is blindingly difficult. It takes up transcendental apperception, the unity and identity of the mind, and the mind’s consciousness of itself as the subject of all its representations (A106–108). I think that this passage introduces either a new stage or even a new starting point for TD. Here many commentators (Strawson, Henrich, Guyer) would think immediately of self-consciousness. Kant did use consciousness of self as a starting point for deductions, at B130 in the B-edition for example. But that is not what appears here, not in the initial paragraphs anyway.