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the traditional view that a Proposition is built up of Names, and an
Argument of Propositions. It is true that of the four meanings of
the term Argument (for the Middle Term, for the Copulation of Premisses,
for the setting out of Premisses and Conclusion, and for the Logical
operation of converting Premisses into Conclusion,) the second
and third justify the traditional account. But in the last sense, which
alone is the essential one, an Argument is no more built up of
Propositions than a motion is built up of positions. So to
regard it is to neglect the very essence of it. As for a Propo-
sition, it is represented in this System by a Graph; and the smallest
significant bit of a Graph is still a Graph, that is to say, the
smallest constituent of a Proposition is a Proposition. Just as it
is strictly correct to say that no body is ever in an exact Position,