The essays in this Festschrift are celebrations of the human mind in its manifold expressions - philosophical, scientific, historical, aesthetic, political - and in its various modes - analytical, systematic, critical, imaginative, constructive. They are offered to Robert S. Cohen on the occasion of his 70th birthday, in acknowledgment of his own extra- ordinary participation in the life of the mind, and of his unfailing encouragement and facilitation of the participation of others. It is fitting that these volumes should appear in the Boston Studies in the Philosophy of Science, the series...