""Matter For Materialists: Letters In Vindication And Extension Of The Principles Regarding The Nature Of Existence Of Dr. Berkeley"" is a book written by Thomas Doubleday in 1870. The book is a collection of letters written in defense and expansion of the philosophical principles of the nature of existence proposed by Dr. Berkeley. The book is primarily aimed at materialists who believe that matter is the fundamental substance of the universe and that everything can be explained by its physical properties. Doubleday argues that this view is flawed and that there is more to existence than just matter. He uses Berkeley's principles to argue that the universe is made up of ideas and that the physical world is merely a collection of these ideas. The book is written in a clear and concise style, making it accessible to both scholars and lay readers. It is a valuable resource for anyone interested in the history of philosophy and the nature of existence.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.