BOOK I PART III
SECTIONV. OF THEIMPRESSIONS OF THE
SENSES ANDMEMORY
In this kind of reasoning, then, from cau-
sation, we employ materials, which are of a
mixed and heterogeneous nature, and which,
however connected, are yet essentially differ-
ent from each other. All our arguments con-
cerning causes and effects consist both of an
impression of the memory or, senses, and of
the idea of that existence, which produces the
object of the impression, or is produced by
it. Here therefore we have three things to ex-
plain, viz. First, The original impression. Sec-
ondly, The transition to the idea of the con-
nected cause or effect. Thirdly, The nature and
qualities of that idea.
As to those impressions, which arise from
the senses, their ultimate cause is, in my opin-