42
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Logic II 42
connected with a system of abstract ideas, --
most frequently numbers, -- and that in such a manner
as to give us [?] reason to guess that those ideas
in some way, [?] usually obscure, [?] determine the
possibilities of the things. For example, chemical
compounds, generally, -- or, at least, the more decidedly
characterized of them, including, it would seem, the
so-called elements, -- seem to belong to types, so that, to
take a simple example, chlorates KClO3, manganates KMn)3,
bromates KBrO3, ruthemiates KRuO3, iodates KIO3, behave in
chemically in strikingly analogous ways. That this sort of
argument for the existence of natural classes, -- I mean
the argument drawn from types, that is, from a
connection of between the things and a system of abstract
formal ideas, -- may be much stronger and more
direct than one might expect to find it, it shown
by the circumstance that ideas themselves, surely and are they
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