 In 1804 , de Candolle published his Essai sur les propriétés <unk> des plantes and was granted a doctor of medicine degree by the medical faculty of Paris . Two years later , he published Synopsis plantarum in flora Gallica <unk> de Candolle then spent the next six summers making a botanical and agricultural survey of France at the request of the French government , which was published in 1813 . In 1807 he was appointed professor of botany in the medical faculty of the University of Montpellier , where he would later become the first chair of botany in 1810 . While in Montpellier , de Candolle published his Théorie <unk> de la botanique ( Elementary Theory of Botany , 1813 ) , which introduced a new classification system and the word taxonomy . Candolle moved back to Geneva in 1816 and in the following year was invited by the government of the Canton of Geneva to fill the newly created chair of natural history . 
