According to the nineteenth-century "science" of phrenology,what could be discerned from the shape of an individual's skull?

Question

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Phrenology claimed to be able to determine an individual's character and intelligence based on the shape of their skull. Other factors such as chances of having children, susceptibility to disease, life expectancy, and future earning potential were not believed to be discernible through phrenology.

According to the Nineteenth-Century "Science" of Phrenology,what Could Be Discerned