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.