Harvey, William.

12mo (110 x 61mm.), with the first form of the substituted title, eighteenth-century half calf with marbled boards, top inner corner of title torn with loss of text but restored in pen and ink, spine repaired at head, joints and corners worn

ESTC R21044; Keynes, Harvey, 30; Wellcome III, p.219; Wing H1087

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With the publication of these two essays addressed to Jean Riolan the younger, a Parisian professor of anatomy whose Opuscula anatomica (1649) had put forward a rival theory of the circulation of the blood, William Harvey finally responded to his many critics. The first of the two essays demolishes Riolan's argument; the second, described by Keynes as "one of [Harvey's] major contributions to medical science" (Life, p.327), refutes Descartes' denial of Harvey's theory.

The work was published simultaneously in Cambridge and Rotterdam. A third edition was published in Paris in 1650; since then it has only been published as an appendix to De motu cordis.