They never had any children. While in Segovia, he started to publish his papers on definite proportions. In 1816, Proust was elected to the French Academy of Sciences to succeed Louis Bernard Guyton de Morveau. After his wife died in 1817, he moved back to Angers where he took over a pharmacy owned by his brother, Joachim, who was poor in health. After this in 1819, he was made the chevalier of the Legion of Honour and he was granted a pension by