The Commens Dictionary
Quote from ‘Notes for my Logical Criticism of Articles of the Christian Creed’
… all Reasoning is either Deduction, Induction, or Retroduction.
[—] I have constantly since 1860, or 50 years, had this question prominently in mind, and if I had ever met with an argument not of one of these three kinds, I must certainly have perceived it. But I never have found any such kind of argument except Analogy, which, as I have shown, is of a nature, – a mixture of the three recognized kinds.