Reprint of the original, first published in 1869.

Coherent, well organized text familiarizes readers with complete theory of logical inference and its applications to math and the empirical sciences. Part I deals with formal principles of inference and definition; Part II explores elementary intuitive set theory, with separate chapters on sets, relations, and functions. Last section introduces numerous examples of axiomatically formulated theories in both discussion and exercises. Ideal for undergraduates; no background in math or philosophy required.

The author discusses statements such as 'virtue is blue' as proposed by a n prior. He agrees with prior to a point but investigates this type of statement, In the end calling for us to drop them from use altogether. (staff).