Franz Joseph Gall on the "deaf and dumb" and the complexities of mind.

Franz Joseph Gall used a broad variety of phenomena in support of his organology. Well known are his observations on anatomical features of the brain, species-specific behavioral patterns, the observation that some individuals may excel in one faculty while being mediocre in others, changes in the organs with development and aging, and how the organs associated with the faculties might be affected by diseases and acute brain lesions. We here present a widely overlooked source: his observations on individuals then classified as "deaf and dumb." We discuss how these observations were presented by Gall in support of his organology and in his disputes with empiricists and sensationalists about the nature of mind.