in a lady that had died in her 12th pregnancy in Paris, he assumed that the complete entity was present in the ovary, brought to life by the influence of the male ejaculatory fluid, and then transported to the uterus. Publications De Graaf, R (1664) De succi pancreatici natura et usu exercitatio anatomico-medica De Graaf, R (1668) De Virorum Organis Generationi Inservientibus, de Clysteribus et de Usu Siphonis in Anatomia De Graaf, R (1672) De mulierum organis generationi inservientibus tractatus novus : demonstrans tam homines & animalia caetera omnia, quae vivipara dicuntur, haud minus quàm ovipara ab ovo originem ducere De Graaf, R (1686) Alle de Wercken. Leyden, Netherlands. References Other sources Houtzager HL. Reinier de Graaf 1641–1673 (Dutch). Rotterdam: Erasmus publishing, 1991. . Ruler Han van (2003). 'Graaf, Reinier de (1641-73)' The Dictionary of 17th and 18th-Century Dutch Philosophers. Bristol: Thoemmes, 2003, vol. 1, 348–9. . Ruler Han van (2007). 'Graaf, Reinier de' Dictionary of Medical Biography. Westport, Conn.: Greenwood, 2007, vol. 2, 570. External links Short biography Britannica entry 1641 births 1673 deaths 17th-century Dutch physicians Dutch anatomists 17th-century Dutch scientists People from Schoonhoven Leiden University alumni Utrecht University alumni University of Angers (pre-1793) alumni Burials at the Oude Kerk, Delft 17th-century Dutch anatomists Biology and natural history in the Dutch Republic