The science of reading character from bumps on the skull: the brain divided into organs of amativeness, combativeness, and veneration, each measurable with calipers.
Documented
Gall's map and the business that ate it
Documented: Gall's lectures from 1796 and his multi-volume work localized faculties in the cortex, a genuinely pioneering claim about brain function, then asserted the skull mirrors the organs beneath. Spurzheim carried it to Britain and America; the Fowler brothers industrialized it, readings, charts, porcelain heads, the merch of measurement. Mainstream anatomy demolished the mechanism by the 1840s: skull shape does not track brain shape, and faculties are not lumpy modules. The social machine ran decades longer than the science.
Assessment: Documented rise and documented collapse of the mechanism. What did not collapse was the format: a precise-looking measurement that sorts people into deserving and undeserving, which has been reissued under new names ever since.
Stories
The head-reader at the fair
The folk version outlived the academy by a century: traveling phrenologists at fairs, phrenology charts in barbershops, employers requesting head examinations, suitors vetted by bump. It democratized a seductive idea, your character is legible, objective, and purchasable by the reading.
Assessment: Documented mass culture. The fairground version is why phrenology matters to this archive: it is the cleanest documented case of a dead science living a second life as folk certainty, immune to the refutation because it was never about the cortex.
Interesting claims
The respectable descendants
The interesting claim is genealogical: criminal anthropology (Lombroso's born criminal, 1876) inherited the calipers; scientific racism used the measurements to rank peoples; intelligence testing inherited the aspiration, one number, one skull, one destiny, with better statistics. Each descendant swore it had purged the pseudoscience while keeping the sorting.
Assessment: Documented lineage, which is the point of filing it here. Phrenology's lesson is not that Victorians were gullible; it is that measurement grants moral license, and the license is what sells. The bumps change names. The calipers do not.
Sources and further reading
Gall, On the Functions of the Brain and of Each of Its Parts (1822-1825), the system itself
Spurzheim, Phrenology (1825), the popularization
Fowler and Fowler, the American phrenology industry records
Lombroso, L'Uomo Delinquente (1876), the criminal-anthropology heir
Gould, The Mismeasure of Man (1981), the lineage case
Worth asking
Every generation gets a phrenology, a measurement that tells the powerful what they already believed. What is ours?