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A newcomer to analysis could be forgiven for underestimating the value of successive articles about the same country, region or city that share similar probabilistic and estimative language.

Turgot distinguishes between “valeur estimative” and “échangeable or appréciative;” the former designating the relation between the amount of energy, physical and mental, which one is willing to spend in order to obtain the goods, to the sum total of his energies, physical and mental; the latter the relation between the aggregate like energy of two persons which they are willing to spend in order to procure each of the goods to be exchanged, and the sum total of their energies in general.

The three are mutually supportive: basic intelligence is the foundation on which the other two are constructed; current intelligence continually updates the  inventory of knowledge; and estimative intelligence revises overall interpretations of country and issue prospects for guidance of basic and  current intelligence.

The Art of Phrenology, on the other hand, is estimative, and the results of its application will depend on the graces, the gifts and the abilities of him who seeks to apply it.

In regard to Phrenology being an exact science, I have shown you that the distinction must be drawn between the principles of the science and the results of their estimative application.