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<p>The principle of inductive inference must be established inductively, that is by reasoning from parts to whole.  This kind of reasoning can apply only to those objects whose parts collectively are their whole.  Now of symbols this is not true.  If I write ''man'' here and ''dog'' here that does not constitute the symbol of ''man and dog'', for symbols have to be reduced to the unity of symbolization which Kant calls the unity of apperception and unless this be indicated by some special mark they do not constitute a whole.  In the same way forms have to determine the same matter before they are added;  if the curtains are green and the wainscot yellow that does not make a ''yellow-green''.  But with things it is altogether different;  wrench the blade and handle of a knife apart and the form of the knife has disappeared but they are the same thing — the same matter — that they were before.  Hence, the principle of induction must relate to the symbolizability of things.</p>

<p>The principle of inductive inference must be established inductively, that is by reasoning from parts to whole.  This kind of reasoning can apply only to those objects whose parts collectively are their whole.  Now of symbols this is not true.  If I write ''man'' here and ''dog'' here that does not constitute the symbol of ''man and dog'', for symbols have to be reduced to the unity of symbolization which Kant calls the unity of apperception and unless this be indicated by some special mark they do not constitute a whole.  In the same way forms have to determine the same matter before they are added;  if the curtains are green and the wainscot yellow that does not make a ''yellow-green''.  But with things it is altogether different;  wrench the blade and handle of a knife apart and the form of the knife has disappeared but they are the same thing — the same matter — that they were before.  Hence, the principle of induction must relate to the symbolizability of things.</p>

<p>All these principles must as principles be universal.  Hence they are as follows:—</p>

<p>All these principles must as principles be universal.  Hence they are as follows:&mdash;</p>

 

<p>All things, forms, symbols are symbolizable.</p>

| align="center" | <p>All things, forms, symbols are symbolizable.</p>

 

<p>(Peirce 1865, "Harvard Lecture 10.  Grounds of Induction", CE 1, 281–282).</p>

<p>(Peirce 1865, Harvard Lecture 10 : Grounds of Induction, CE 1, 281&ndash;282).</p>

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