Karl Ernst Claus

Baltic german scientist (1796-1864).

Karl Ernst Claus, also known as Karl Klaus or Carl Claus (Russian: Карл Ка́рлович Кла́ус, romanized: Karl Karlovich Klaus; 22 January 1796 – 24 March 1864), was a Russian chemist and naturalist. Claus was a professor at Kazan University and a member of the Russian Academy of Sciences. He was primarily known as a chemist and discoverer of the chemical element ruthenium, which he named after his homeland of Russia, but also as one of the first scientists who applied quantitative methods in botany.