A _concrete concept_, or concrete idea (for concept and idea are
interchangeably used), is an idea of a particular object or quality.
Examples: This wine-sap apple (object concept).
This sweet orange (quality concept).
An _abstract concept_, or abstract idea, is a mental reproduction of a
quality or an object dissociated from any particular setting or
particular experience.
Abstract ideas are of two kinds. We speak of them as _abstract object
concepts_ and as _abstract quality concepts_. An _abstract object
concept_ we might call a generalized idea, an idea comprehending all
objects having certain things in common.
Example: My idea of animal includes many scores of very different
individual animals, but they all have bodies and heads and extremities.
They all have some kind of digestive apparatus; they breathe, and can
move.
An _abstract quality concept_ is easier to think than to explain. It is
as though the mind in considering a multitude of different objects found
a certain quality common to many of them, and it "abstracted," _i.
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