pen in the machine of
the body. This set of thoughts is like the tablature prescribed to the
singing animal above mentioned. Can the soul change its perceptions or
modifications at every moment according to such a set of thoughts, without
knowing the series of the notes, and actually thinking upon them? But
experience teaches us that it knows nothing of it. Were it not at least
necessary that in default of such a knowledge, there should be in the soul
a set of particular instruments, each of which would be a necessary cause
of such and such a thought? Must they not be so placed and disposed as to
operate precisely one after another, according to the correspondence
_pre-established_ between the changes of the body and the thoughts of the
soul? but it is most certain that an immaterial simple and indivisible
substance cannot be made up of such an innumerable multitude of particular
instruments placed one before another, according to the order of the
tablature in question. It is not therefore possible that a human soul
should execute that law.

'M. Leibniz supposes that the soul does not distinctly know its future
perceptions, _but that it perceives them confusedly_, and that _there are
in each substance traces of whatever hath happened, or shall happen to it:
but that an infinite multitude of perceptions hinders us from
distinguishing them. The present state of each substance is a natural
consequence of its preceding state. The soul, though never so simple, has
always a sentiment composed of several perceptions at one time: which
answers our end as well as though it were composed of pieces, like a
machine. For each foregoing perception has an influence on those that
follow agreeably to a law of order, which is in perceptions as well as in
motions...The perceptions that are together in one and the same soul at the
same time, including an infinite multitude of little and indistinguishable
sentiments that are to be unfolded, we need not wonder at the infinite
variety of what is to result from it in time. This is only a consequence of
the representative nature of the soul, which is, to express what happens
and what will happen in its body, by the connexion and correspondence of
all the parts of the world_. I have but little to say in answer to this: I
shall only observe that this supposition when sufficiently cleared is the
right way of solving all the difficulties. M. Leibniz, through the [46]
penetration of his great gen