A Treatise on Logic, Pure and Applied #261886

This it is which confers such rigorous accuracy upon all the results and developments Of Logic. Indeed, as Professor De Morgan has said, Mathematics and Logic are the two exact sciences. The primary doctrines of chemistry may require alteration as new combinations of the elements are brought to light the progressive theories of physiology are modified with every advance of microscopical investigation; the glorious revelations of astronomy present an ever-changing aspect; but Logic, like Mathematics abides, eternal and immutable.