2013 Reprint of 1941 Revised and Enlarged Edition. Exact facsimile of the original edition not reproduced with Optical Recognition Software. Tarski is considered one of the five greatest logicians of all time alongside Aristotle (384-322 BCE) Boole (1815-1864) Frege (1848-1925) and Godel. This book together with Aristotles Prior Analytics and Booles Laws of Thought should form the core of any logic library. This classic undergraduate treatment examines the deductive method in its first part and