Dr. Taylor's volume on Greek Biology and Medicine is the third to appear in the new Library, Our Debt to Greece and Rome. The author has drawn his sketch in such a way as to make clear the in?uence of ancient biological and medical theories and of the ancient medical practice upon our intellectual life, to-day, giving frequent allusions to that in?uence as it affected distinguished biologists and men of medicine during the intervening centuries. This is part of the larger plan Of the Library as a Whole to Show in some detail the vitality of the ancient thought and to make more articulate the significance it pos sesses for us. We all too unconsciously ac cept a heritage — scientific, intellectual, spir itual which lies at the very core of our being and is the real hope of an orderly future.