Jean Baptiste Antoine Guillemin
He worked there for eighteen months, but his interest in chemistry and desire to obtain a commission as a military pharmacist, at a time when it was difficult to avoid conscription, caused him to abandon the study of law.After two years in that city, he went to Geneva, where he studied with Jean Pierre Étienne Vaucher (1763–1841) and Augustin Pyramus de Candolle (1778–1841).The injury was slow to heal, and the accident left him with permanent stiffness in the elbow joint.In 1820 he relocated to Paris, where he became curator of the herbarium and library of botanist Jules Paul Benjamin Delessert (1773–1784).While there, he collected plants with Ludwig Riedel (1790-1861) of the National Museum of Rio de Janeiro.