Rational Psychology

external forces as such, which induce changes in the organs accordingly (§ 67. Empirical Psychology); and upon this faculty of sensing depends the faculty of imagination (§ 91. Empirical Psychology), as do other faculties of the mind (§ 237, 257, etc. Empirical Psychology). Indeed, changes of the mind depend on changes of our body (§ 948. Empirical Psychology) and certain movements of the body depend on the will of the soul (§ 953. Empirical Psychology). Therefore, since Cosmology The branch of philosophy that studies the physical universe, its laws, and the nature of matter. provides the general theory of the world or the corporeal universe (§ 1. Cosmology) and of bodies (§ 119 and following, Cosmology), the principles of demonstration must also be sought from Cosmology. This was the third point.

Now, since the soul is a certain species of being original: "ens." A general term for anything that exists or can exist., as was demonstrated just before—and indeed a simple being An entity that is not composed of parts, similar to the concept of a "monad" or an indivisible unit of reality., as we shall show below—it recognizes no closer genus In logic, the broader category to which a specific thing belongs. than simple being or simple substance, nor any more remote genus other than being itself. Consequently, it presupposes no theory other than that of being in general and of simple being in particular. Therefore, the theory of being in general and of simple being is provided in Ontology The study of the nature of existence and the categories of being. (§ 132 and following, and § 673 and following, Ontology). Meanwhile, those things which must be observed a posteriori Knowledge derived from experience and observation rather than from pure logic. regarding the soul's specific difference from other simple beings are provided in Empirical Psychology (§ 1. Empirical Psychology). Furthermore, the soul's relationship to the body is made clear through the theory of the body in general and the general theory of the world—which, as is established from the sections below, is provided in Cosmology through those things already demonstrated. Thus, we have no need of seeking principles from other disciplines besides those to be borrowed from Ontology, Cosmology, and Empirical Psychology. This was the fourth point.

And this is the reason why we have placed Ontology, Cosmology, and Empirical Psychology before Rational Psychology in our system (§ 57. Preliminary Discourse).

§. 4.

In Rational Psychology, a reason must be given for those things which [Empirical] Psychology The text ends mid-sentence. The catchword indicates the next page begins with "rationalis."