The theory that the mental powers or characteristics of an individual consist of separate faculties, each of which has its location in an organ found in a definite region of the surface of the brain, the size or development of which is commensurate with the development of the particular faculty; the study of the external conformation of the cranium as an index to the position and degree of development of the various faculties. [OED]

Phrenological Chart produced by the Edinburgh Phrenological Society
[History of the Edinburgh Phrenological Society 1820-1830
University of Wisconsin
Winsconinhttps://sites.google.com/a/wisc.edu/ils202fall11/home/student-wikis/group7]

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