This universe consists in the first place of
certain mutually well-understood centres, or
subjects of force well-understood to be different from
one another; secondly, of certain subjects of
force well-understood to exist, but not
thoroughly understood to be known to be different
from any of these of the first class; and thirdly
of an indefinite supplement of subjects of force
presumed to exist but of which there has been no
definite recognition. Summing up the matter,
we may say that the universe of discourse is the
aggregate of subjects of the complexus of mutually well-known
experience-forces well-understood between
the graphist, or he who scribes the graph, and the
interpreter of it.

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Contents of this unnumbered page appear to be intended to follow line 2 of the preceding page (4). See note on that page.