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The following pages set out to give a short and simplified survey of the development of the psycho-analytical theory of the instincts. It is based essentially upon the works of Freud, since, however tempting it may be to take into account the whole of the psycho-analytical literature on the subject, to do so would complicate our exposition too much. … The survey follows a chronological order (except in one place, in connection with the fourth step in the history of the theory) but naturally this does not apply to the detailed discussion of certain points.
Before embarking on my actual theme, let me say a few words about the subdivision of the branch of knowledge of which the theory of the instincts is only a part. The psycho-analytical study of the instincts in made up of two main parts, a general theory of the instincts and a specialized one. The general theory includes, besides the concept of instinct, the theory of the instincts in the narrower sense, that is, the question of the number and nature of the instincts, the question of the criteria of their classification, and the question of their causation and function; the general theory further includes the theory of instinctual transformation, i.e. the question of the variability of instincts and the laws which such variations (which are in part the