François ARAGO (1786-1853). 8 L.A.S., [ca. 1840-1850], to Antoine Boutron-Charlard; 9pages in-4 or in-8, 5 addresses and 2 envelopes. To his "colleague" the pharmacist and chemist Boutron-Charlard (1796-1879), Paris city councilor and member of the Académie de Médecine, about meetings and summonses... "I am detained in the Chamber by the question of the port of Algiers. I will escape as soon as I can, as I would like to take part in the discussion of your report on filtering"...