Phrenology was a science of character divination, faculty psychology, theory of brain and what the 19th-century phrenologists called "the only true science of mind." Phrenology came from the theories of the idiosyncratic Viennese physician Franz Joseph Gall (1758-1828).
So it was believed that by examining the shape and unevenness of a head or skull, one could discover the development of the particular cerebral "organs" responsible for different intellectual aptitudes and character traits. For example, a prominent protuberance in the forehead at the position attributed to the organ of Benevolence was meant to indicate that the individual had a "well developed" organ of Benevolence and would therefore be expected to exhibit benevolent behaviour.
