In what follows, I will deal with some aspects of Brentano's theory and terminology concerning the nature of the psychical, i.e. his descriptive psychological analysis which is, in fact, an early phenomenological theory about mental states, their structure, their mutual relation, and their intentional correlates (objects and contents). This theory goes along with his ontological theory of mind, which is an application of Aristotelian substance-accident or part-whole ontology, to the realm of mind, or more concretely, to a thinking person.¹