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1
First we must define the terms ’noun’ and ’verb’, then the terms ’denial’ and
’affirmation’, then ’proposition’ and ’sentence.’
Spoken words are the symbols of mental experienc e and written words are
the symbols of spoken words. Just as all men have not the same writing, so
all men have not the same speech sounds, but the mental experiences,
which these directly symbolize, are the same for all, as also are those things
of which our experiences are the images. This matter has, however, been
discussed in my treatise about the soul, for it belongs to an investigation
distinct from that which lies before us .
As there are in the mind thoughts whic h do not involve truth or fals ity, and
also those which must be either true or false, so it is in speech. For truth and
fals ity imply combination and s eparation. Nouns and verbs, prov ided nothing
is added, are like thoughts without combination or separation; ’man’ and
’white’, as isolated terms, are not yet either true or fals e. In proof of this,
consider the word ’goat-stag.’ It has significanc e, but there is no truth or
fals ity about it, unless ’is’ or ’is not’ is added, either in the present or in some
other tense.
2
By a noun we mean a sound significant by convention, which has no
reference to time, and of which no part is significant apart from the rest. In the
noun ’Fairsteed,’ the part ’steed’ has no significance in and by itself, as in the
phrase ’fair steed.’ Yet there is a difference between simple and composite
nouns; for in the former the part is in no way significant, in the latter it
contributes to the meaning of the whole, although it has not an independent
meaning. Thus in the word ’pirate-boat’ the word ’boat’ has no meaning
exc ept as part of the whole word.
The limitation ’by convention’ was introduced because nothing is by nature
a noun or name-it is only s o when it becomes a symbol; inarticulate sounds,
suc h as those which brutes produce, are significant, yet none of these
constitutes a noun.
The expression ’not-man’ is not a noun. There is indeed no recognized
term by which we may denote such an expression, for it is not a sentence or a
denial. Let it then be called an indefinite noun.
The expressions ’of Philo’, ’to Philo’, and so on, constitute not nouns, but
cas es of a noun. The definition of these cases of a noun is in other respects
the same as that of the noun proper, but, when coupled with ’is’, ’was’, or will
be’, they do not, as they are, form a proposition either true or false, and this
the noun proper always does, under these conditions. Take the words ’of
Philo is ’ or ’of or ’of Philo is not’; these words do not, as they stand, form
either a true or a false proposition.
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