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The system of expression which I am about to describe is a system of diagrams.
A diagram appeals to the eye like a picture, while it differs from a picture in that it obstrusively invoves conventional signs.
A conventional sign, since Aristotle and eariler recieved the name of symbol; but besides conventional symbols there are signs of the same nature except that instead of being based on express conventions they depend on natural dispositions.
They are natural symbols.
All thought takes place by means of natural symbols and of convential symbols that have become naturalized.
Every symbol is employed over and over again, and we call all the occurences of it occurrences of the same symbol.
That is to sat, it is the general type that makes the symbol, or its being made according to certain general precepts.
A word is, therefore, wanted for the single embodiment of the symbol.
I call it a replica.
For example one word, namely the, will generally be repeated in ordinary English about once in from fifteen