Psychic reader's porcelain phrenology head statue on outdoor table at street fair.<br />
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Phrenology is a process that involves observing and/or feeling the skull to determine an individual's psychological attributes. Franz Joseph Gall believed that the brain was made up of 27 individual organs that determined personality, the first 19 of these 'organs' he believed to exist in other animal species. Phrenologists would run their fingertips and palms over the skulls of their patients to feel for enlargements or indentations.<br />
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 The phrenologist would often take measurements with a tape measure of the overall head size and more rarely employ a craniometer, a special version of a caliper. In general, instruments to measure sizes of cranium continued to be used after the mainstream phrenology had ended. The phrenologists put emphasis on using drawings of individuals with particular traits, to determine the character of the person and thus many phrenology books show pictures of subjects. From absolute and relative sizes of the skull the phrenologist would assess the character and temperament of the patient.