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Nor will it be out of place here to utter a warning against any over-hasty generalization of what we have brought to light concerning the distribution of the various mental functions between the two systems. We are describing the state of affairs as it appears in the adult human being, in whom the system Ucs. operates, strictly speaking, only as a preliminary stage of the higher organization. The question of what the content and connections of that system are during the development of the individual, and of what significance it possesses in animals - these are points on which no conclusion can be deduced from our description: they must be investigated independently. Moreover, in human beings we must be prepared to find possible pathological conditions under which the two systems alter, or even exchange, both their content and their characteristics.