n to
every phenomenon of the same kind, without waiting for that constant
repetition, from which the first idea of this relation is derived.

(5) There is another principle, which hangs upon this, viz. that where
several different objects produce the same effect, it must be by means
of some quality, which we discover to be common amongst them. For as
like effects imply like causes, we must always ascribe the causation to
the circumstance, wherein we discover the resemblance.

(6) The following principle is founded on the same reason. The
difference in the effects of two resembling objects must proceed from
that particular, in which they differ. For as like causes always
produce like effects, when in any instance we find our expectation to be
disappointed, we must conclude that this irregularity proceeds from some
difference in the causes.

(7) When any object encreases or diminishes with the encrease or
diminution of its cause, it is to be regarded as a compounded effect,
derived from the union of the several different effects, which arise
from the several different parts of the cause. The absence or presence
of one part of the cause is here supposed to be always attended with
the absence or presence of a proportionable part of the effect. This
constant conjunction sufficiently proves, that the one part is the cause
of the other. We must, however, beware not to draw such a conclusion
from a few experiments. A certain degree of heat gives pleasure; if you
diminish that heat, the pleasure diminishes; but it does not follow,
that if you augment it beyond a certain degree, the pleasure will
likewise augment; for we find that it degenerates into pain.

(8) The eighth and last rule I shall take notice of is, that an object,
which exists for any time in its full perfection without any effect, is
not the sole cause of that effect, but requires to be assisted by some
other principle, which may forward its influence and operation. For as
like effects necessarily follow from like causes, and in a contiguous
time and place, their separation for a moment shews, that these causes
are not compleat ones.

Here is all the LOGIC I think proper to employ in my reasoning; and
perhaps even this was not very necessary, but might have been supplyd by
the natural principles of our understanding. Our scholastic head-pieces
and logicians shew no such superiority above the mere vulgar in their
reason and ability, as to give us any inclinatio