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<p>Thus we have in order of strength Deduction, Induction, Hypothesis.  Deduction, in fact, is the only demonstration;  yet no one thinks of questioning a good induction, while hypothesis is proverbially dangerous.  ''Hypotheses non fingo'', said Newton, striving to place his theory on a basis of strict induction.  Yet it is hypotheses with which we must start;  the baby when he lies turning his fingers before his eyes is making a hypothesis as to the connection of what he sees and what he feels.  Hypotheses give us our facts.  Induction extends our knowledge.  Deduction makes it distinct.</p>

<p>Thus we have in order of strength Deduction, Induction, Hypothesis.  Deduction, in fact, is the only demonstration;  yet no one thinks of questioning a good induction, while hypothesis is proverbially dangerous.  ''Hypotheses non fingo'', said Newton, striving to place his theory on a basis of strict induction.  Yet it is hypotheses with which we must start;  the baby when he lies turning his fingers before his eyes is making a hypothesis as to the connection of what he sees and what he feels.  Hypotheses give us our facts.  Induction extends our knowledge.  Deduction makes it distinct.</p>

<p>(Peirce 1865, "Harvard Lecture 10.  Grounds of Induction", CE 1, 283).</p>

<p>(Peirce 1865, Harvard Lecture 10 : Grounds of Induction, CE 1, 283).</p>

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