1899 onwards the Government Privy Council Max Vollert), Czapski played an ever greater role in managing the company, something that took an increasing toll on his health. Abbe already had the university trustee Heinrich Eggeling and the lawyer Eduard Rosenthal involved in drawing up the Foundation statutes and he soon included Czapski in that task – even though by this point Czapski was increasingly overwhelmed by concerns and problems relating to the workforce. Work on the statutes was completed in 1895/96. Siegfried and Margarete Czapski In 1885 Czapski's life changed dramatically when he met and fell in love with Margarete Koch. Margarete (officially spelled Marguerite) was the granddaughter of Abbe's teacher, the mathematician and physicist Karl Snell. Margarete's father was a professor at a grammar school in Paris and a nephew of Juliette Drouet, who was Victor Hugo's partner for much of his life. His wife Ottilie Koch (née Snell) often brought their daughter to visit her father in Jena. Ottilie was also the sister of Abbe's wife, Else Abbe. It was inevitable that 24-year-old Czapski and 19-year-old Margarete Koch would eventually meet. Just weeks after getting to know each other they got engaged, secretly at first. They agreed that they would marry when Margarete turned 21. The wedding took place on 11 August 1887. Their marriage produced eight children: 1888 Charlotte ("Lotte") 1889 Hans 1891-1968 Helene, married name Holzman 1892 Ewald 1894 Elisabeth, married Wilhelm Flitner 1896 Dorothea 13 July 1902 Reinhardt 22 December 1903 Anna-Maria ("Anni") Czapski had long been suffering from ill health, and his huge workload made the situation even more difficult. On 29 June in Weimar he died of a pulmonary embolism due to complications after an appendectomy. Having been the close working companion of his friend and mentor Ernst Abbe, and ultimately his successor, Czapski was only destined to outlive Abbe by a mere two-and-a-half years. Honor A street in Jena, near the Carl Zeiss works, is named after him: Siegfried-Czapski-Straße, a few blocks off Zeiss Promenade. Publications His most important publication was Theorie der optischen Instrumente, nach Abbe (Breslau: Trewendt, 1893). Further reading Andreas Flitner, Joachim Wittig (ed.): Optik – Technik – Soziale Kultur. Siegfried Czapski, Weggefährte und Nachfolger Ernst Abbes. Briefe, Schriften, Dokumente, Hain-Verl., Rudolstadt 2000, Friedrich Stier: Czapski, Siegfried. In: Neue Deutsche Biographie (NDB). Vol. 3, Duncker & Humblot, Berlin 1957, , p. 456 f. (digitized copy). References External links collected