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An introverted and an extroverted man; exhibiting excessive and lacking propensities connected with the faculty of causality (reflective thought) in phrenology. Steel engraving by E. Monnin, 1847, after H. Bruyères.

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An introverted and an extroverted man; exhibiting excessive and lacking propensities connected with the faculty of causality (reflective thought) in phrenology. Steel engraving by E. Monnin, 1847, after H. Bruyères.