Images

A statue of the English physician William Harvey (1578-1657) who discovered the circulatory system in 1628. Folkestone, England, where Harvey was born.

A painting showing William Harvey (1578-1657) demonstrating to King Charles I of England (r. 1625-1649) his theory of the circulatory system.

Austrian grenadiers defend the town of Aderklaa from French troops during the Battle of Wagram, 6 July 1809. By an unknown author, 19th century.

French Marshal Louis-Nicolas Davout orders the assault of Markgrafneusiedl during the Battle of Wagram (5-6 July 1809), after his horse has been shot out from under him. By an unknown author, c. 19th century.

Rosa Noisettiana, aka Noisette rose, print by Pierre Joseph Redouté, published in 1817-24. Print Collection, The New York Public Library.

Rosa Centifolia, also known as cabbage rose.

The Roses of Heliogabalus, oil on canvas by Lawrence Alma-Tadema, 1888.

Rosa blanda, etching by Mary Lawrance, 1799. Rare Book Division, The New York Public Library.

Leo Lesquereux, 19th-century paleobotanist, image by an unknown artist, published in Popular Science Monthly April 1887.

The Gracchi, sculpture by Jean-Baptiste Claude Eugène Guillaume, 19th century. Musée d'Orsay, Paris.