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Many developmental formulations about the id are scattered throughout Freud's writings. I shall discuss only the most pertinent ones. In view of the intimate relationship between the concept id and instinctual drives, this part of my discussion applies to the developmental formulations of both.
Freud introduced genetic1 considerations concerning the mental apparatus in Chapter VII of The Interpretation of Dreams (1900). Although these statements are particularly important for my topic, I shall first discuss his later ones. Freud's genetic formulations fall into the following categories:
Evolutional
Ontogenetic
innate endowment
maturation
development
In “Instincts and Their Vicissitudes” (1915a) Freud stated: