etc.

(4) All those objects, which admit of QUANTITY, or NUMBER, may be
compared in that particular; which is another very fertile source of
relation.

(5) When any two objects possess the same QUALITY in common, the DEGREES,
in which they possess it, form a fifth species of relation. Thus of two
objects, which are both heavy, the one may be either of greater, or less
weight than the other. Two colours, that are of the same kind, may yet be
of different shades, and in that respect admit of comparison.

(6) The relation of CONTRARIETY may at first sight be regarded as an
exception to the rule, THAT NO RELATION OF ANY KIND CAN SUBSIST WITHOUT
SOME DEGREE OF RESEMBLANCE. But let us consider, that no two ideas are in
themselves contrary, except those of existence and non-existence, which
are plainly resembling, as implying both of them an idea of the object;
though the latter excludes the object from all times and places, in which
it is supposed not to exist.

(7) All other objects, such as fire and water, heat and cold, are only
found to be contrary from experience, and from the contrariety of their
causes or effects; which relation of cause and effect is a seventh
philosophical relation, as well as a natural one. The resemblance implied
in this relation, shall be explained afterwards.

It might naturally be expected, that I should join DIFFERENCE to the
other relations. But that I consider rather as a negation of relation,
than as anything real or positive. Difference is of two kinds as opposed
either to identity or resemblance. The first is called a difference of