  Around 1635, at the University of Utrecht, Reneri began teaching “Cartesian” physics. Also during this year, a domestic servant by the name of Helene gave birth to a baby girl, Francine. Genevieve Rodis-Lewis claims that Francine was born 19 June 1635 (Rodis-Lewis, p. 40). According to a baptismal record, dated 28 July 1635, Descartes is named the father (AT I 395n). However, Gaukroger claims that the baptismal date was 7 August 1635 (Gaukroger, p. 294). In 1636 Reneri acquired an official chair in Philosophy at the University of Utrecht, and continued to build a following of students interested in Cartesian science. Around March of 1636, at the age of forty, Descartes moved to Leiden to work out the publishing of the Discourse. And, in 1637 it is published.  With the Discourse out and a following of students building in Utrecht, Descartes seems to have turned his attention from career to family. In a letter dated 30 August 1637 we find him apparently working out an arrangement for Francine, but strangely refers to her as his “niece”—which suggests that he did not want certain people to know that he was a father (or that Francine had been born out of wedlock). Gaukroger suggests that despite this apparent denial of paternity, Descartes not only corresponds with Francine, but in 1637 brings her and Helene to his new home at Santpoort or Egmond-Binnen (Gaukroger, pp. 294, 332).