In Mechanization of the Heart: Harvey and Descartes Thomas Fuchs begins by comparing the views of William Harvey (1578-1657) and Rene Descartes (1596-1650) on the heart and the circulation of the blood through the body. These two seventeenth-century scholars - one a British medical doctor, the other a French philosopher and mathemetician - differed substantially in their beliefs: they both accepted the idea of circulation of the blood, but differed on the action of the heart. Fuchs traces the ways the opposing views were received, revised, rejected, or renewed in succeeding generations by medical writers in various parts of Europe. He then examines Harvey's approach to cardiac and circulatory physiology, mainly through an examination of Harvey's book De motu cordis: he follows with a discussion of the background in Aristotelian philosophy that was the requirement for all studies in medicine and how that affected Harvey's beliefs. Fuchs then turns to Descartes' presentation of Harvey's views and shows how his view, rather than Harvey's, was accepted in Europe at that time. Marjorie Grene brings to the translation her distinguished background in philosophy and her keen insights into medical philosophy. Thomas Fuchs teaches psychiatry at the Rupert-Karls-Universitat, Heidelberg. Marjorie Grene is Professor Emeritus of Philosophy at the University of California at Davis, and Adjunct Professor and Honorary Distinguished Professor of Philosophy at Virginia Tech University.