Physiognomy and Phrenology

Theories on crime and delinquency are categorized into Biological Theories, Psychological Theories and Sociological Theories. Physiognomy and Phrenology are under the Biological Theories.

In Physiognomy, Johan Caspar Lavater claimed about the alleged relation between facual features and human conduct.

Phrenology is a pseudoscience that claim to determine personality and intelligence on the basis of the size and shape of a person's skull.