cover MPO-2a: 1837 (11 Sept.) entire letter, with disinfection slits, to Switzerland showing a good to fine strike partly overstruck by framed "PAQUEBOTS/DE LA/MEDITERRANEE" in black; the contents include "The cholera continues to go in the same way as when I last wrote, that is to say about one or two new cases a day...It has broken out at Marseilles, Rome Naples, Genoa, Leghorn and in short at all the seaports except Nice...there hasn't been a case of the cholera in the army or navy for a month.." Photo