In a criticism of the existence of a type of these things, one philosopher asks rhetorically whether children cannot talk about sugar-plums, rattles and trinkets without framing these things. The first of a list of thirteen objections describes a “chimerical scheme” of these things in a book that attempts to disprove the existence of the “abstract general” type of these things. In one work, these things are contrasted with (*) spirits, the knowledge of which is not immediate. The book A Treatise Concerning the Principles of Human Knowledge argues that the external world is comprised solely of these things. A proponent of a school of thought named for these things and the word “subjective” was George Berkeley. For 10 points, name these things perceived by the mind, which name (-5[1])a school of thought contrasted with realism. ■END■ (10[3]0[1])