### A System of Logic

#### John Stuart Mill

Book 3, Chapter 23, Footnote #01

__Plain deduction takes us not far__

Mr. De Morgan,
in his Formal Logic, makes the just remark, that from two such
premises as Most A are B, and Most A are C, we may infer with
certainty that some B arc C. But this is the utmost limit of the
conclusions which can be drawn from two approximate generalisations,
when the precise degree of their approximation to universality is
unknown or undefined.

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Sol, Book 3, Chapter 23 Of Approximate Generalisations, and Probable Evidence