cient number of experiments, rest contented with that, when
he sees a farther examination would lead him into obscure and uncertain
speculations. In that case his enquiry would be much better employed in
examining the effects than the causes of his principle.

Amongst the effects of this union or association of ideas, there are
none more remarkable, than those complex ideas, which are the common
subjects of our thoughts and reasoning, and generally arise from some
principle of union among our simple ideas. These complex ideas may be
divided into Relations, Modes, and Substances. We shall briefly examine
each of these in order, and shall subjoin some considerations concerning
our general and particular ideas, before we leave the present subject,
which may be considered as the elements of this philosophy.

SECT. V. OF RELATIONS.

The word RELATION is commonly used in two senses considerably different
from each other. Either for that quality, by which two ideas are
connected together in the imagination, and the one naturally introduces
the other, after the manner above-explained: or for that particular
circumstance, in which, even upon the arbitrary union of two ideas in
the fancy, we may think proper to compare them. In common language the
former is always the sense, in which we use the word, relation; and it
is only in philosophy, that we extend it to mean any particular subject
of comparison, without a connecting principle. Thus distance will be
allowed by philosophers to be a true relation, because we acquire an
idea of it by the comparing of objects: But in a common way we say, THAT
NOTHING CAN BE MORE DISTANT THAN SUCH OR SUCH THINGS FROM EACH OTHER,
NOTHING CAN HAVE LESS RELATION: as if distance and relation were
incompatible.

It may perhaps be esteemed an endless task to enumerate all those
qualities, which make objects admit of comparison, and by which the
ideas of philosophical relation are produced. But if we diligently
consider them, we shall find that without difficulty they may be
comprised under seven general heads, which may be considered as the
sources of all philosophical relation.

(1) The first is RESEMBLANCE: And this is a relation, without which
no philosophical relation can exist; since no objects will admit
of comparison, but what have some degree of resemblance. But though
resemblance be necessary to all philosophical relation, it does not
follow, that it always produces a connexion o