Speculum Mentis, or The Map of Knowledge

“As its title indicates, this volume aims in a sense to be `The Mirror of the Mind,' and no other book of recent years has so clearly explored the territory of thought. With a persuasiveness that carries the reader inevitably on, with illustrations that clarify complex problems, anticipating objections with reasoned refutation, the author moves with startling certainty among the so-called provinces of the mind, analyzing the various forms of expression developed in man.”– Literary Review