This text is comprised of three parts. The concept of the genital archaic is re-examined and established as the prime mover of the pubertaire. Subjectivation or adolescens has its origin in the earliest mechanisms for managing the original trials : cathexis, withdrawal of cathexis and counter-cathexis. The concepts of original repression and suppression are particularly studied in the avatars of the construction of the pubertaire scene. The so-called clinic of the breakdown is theorized in a new way. A study of dream functioning at puberty revisits the processes in play by way of clinical work.