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In psycho-analysis there is no choice for us but to assert that mental processes are in themselves unconscious, and to liken the perception of them by means of consciousness to the perception of the external world by means of the sense-organs. We can even hope to gain fresh knowledge from the comparison. The psycho-analytic assumption of unconscious mental activity appears to us, on the one hand, as a further expansion of the primitive animism which caused us to see copies of our own consciousness all around us, and, on the other hand, as an extension of the corrections undertaken by Kant of our views on external perception. Just as Kant warned us not to overlook the fact that our perceptions are subjectively conditioned and must not be regarded as identical with what is perceived though unknowable, so psycho-analysis warns us not to equate perceptions by means of consciousness with the unconscious mental processes which are their object. Like the physical, the psychical is not necessarily in reality what it appears to us to be. We shall be glad to learn, however, that the correction of internal perception will turn out not to offer such great difficulties as the correction of external perception - that internal objects are less unknowable than the external world.