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Substances Single or Collective.       §6. Secondly, The Ideas of Substances are such combinations of
simple Ideas, as are taken to represent distinct particular things
subsisting by themselves; in which the supposed, or confused Idea
of Substance, such as it is, is always the first and chief. Thus if to
Substance be joined the simple Idea of a certain dull whitish colour,
with certain degrees of Weight, Hardness, Ductility, and Fusi-
bility, we have the Idea of Lead; and a combination of the Ideas of a
certain sort of Figure, with the powers of Motion, Thought, and
Reasoning, joined to Substance, make the ordinary Idea of a Man.
Now of Substances also, there are two sorts of Ideas; one of single
Substances, as they exist separately, as of a Man, or a Sheep; the
other of several of those put together, as an Army of Men, or Flock
of Sheep; which collective Ideas of several Substances thus put
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together, are as much each of them one single Idea, as that of a
Man, or an Unite.
Locke Hum II, 12, §6, pp. 165-166