First published in 1938, The Doctrine of Signatures, “is one of the first and most significant works in our time to show how closely connected the liberal arts to clinical medicine.” By this 1991 reprint, Buchanan’s work is considered a “truly seminal work, that serves as a model of how the philosopher can start with the realities of medicine and move to the most fundamental considerations, not as an esoteric speculative exercise, but as a reflection on actual experience.”