This document provides an introduction to psychiatry, discussing Sigmund Freud's concepts of the psychic apparatus including the id, ego, and superego. It briefly mentions puerperal psychosis, describing it as a type of psychosis that can occur after birth and before the first month, with symptoms such as hallucinations, voices, delusions, and ideas of demonic possession, and notes the mother may abandon her family or the child could be endangered. Examples of neurosis include phobias and anxiety disorders, while psychosis examples given are schizophrenia and bipolar disorder.