This classic work on metaphysics and logic provides a deep understanding of these subjects from some of the most prominent thinkers of the 19th century. With clear and concise language, readers will learn about the nature of reality, the limits of human knowledge, and the principles of logical reasoning. This book is an essential resource for anyone interested in the foundations of philosophy and logic. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.