This limited edition should fill a most important place in the library of medical historians. Dr. Keynes has made a life-long study of Harvey; therefore, this bibliography has much research work behind it. The first edition, published in 1928, was a part of the commemoration of the tercentenary of the first publication of "De Motu Cordis." The works of Harvey, especially "De Motu Cordis," can still be read with great profit by research workers, since they illustrate careful planning and methodical pursuit coupled with conservative interpretations. The chapter dealing with "De Motu Cordis" is particularly useful for those who want to get a quick résumé of this immortal work.