Abstract

In disproof of the materialist principle, that common things exist unperceived, and in defence of the New Principle, Philonous here objects that it is inconceivable that a common thing should do so. Hylas replies that, on the contrary, we can and do think of, e.g., a tree standing alone as opposed to a tree being perceived by an observer. But Philonous counter-objects to this reply that it contains a contradiction, since it asserts that we can think of something which is not thought of.