It is true of the mineral specimens constituting a
mineral species, and I remember as a constant refrain in the lectures of
Professor Judd upon rock classification, the words, "they pass into one
another by insensible gradations." It is true, I hold, of all things.
You will think perhaps of atoms of the elements as instances of
identically similar things, but these are things not of experience but
of theory, and there is not a phenomenon in chemistry that is not
equally well explained on the supposition that it is merely the immense
quantities of atoms necessarily taken in any experiment that masks by
the operation of the law of averages the fact that each atom also has
its unique quality, its special individual difference.
This ideal of uniqueness in all individuals is not only true of the
classifications of material science; it is true and still more evidently
true of the species of common thought; it is true of common terms. Take
the word "Chair." When one says chair, one thinks vaguely of an average
chair. But collect individual instances; think of armchairs and
reading-chairs and dining-room chairs, and kitchen chairs, chairs that
pass into benches, chairs that cross the boundary and become settees,
dentist's chairs, thrones, opera stalls, seats of all sorts, those
miraculous fungoid growths that cumber the floor of the Arts and Crafts
exhibition, and you will perceive what a lax bundle in fact is this
simple straightforward term.
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