books.google.co.uk - In George Berkeley's two most important works, the Principles of Human Knowledge and Three Dialogues Bewtween Hylas and Philonous, he argued that there is no such thing as matter: only minds and ideas exist, and physical things are nothing but collections of ideas. In defense of this idealism, he advanced...http://books.google.co.uk/books/about/Berkeley_s_Idealism.html?id=XBqQXI3JGeEC&utm_source=gb-gplus-shareBerkeley's Idealism
