Frédéric CAILLIAUD (1787-1869) naturalist, archaeologist and explorer. L.A.S., Nantes November 17, 1828, to Jean-Louis Hardouin Michelin; 2 pages in-4, address. To paleontologist and conchyliologist Hardouin-Michelin de Choisy. [On his return from his long expeditions in Egypt, F. Cailliaud became assistant curator of the Museum of Natural History of Nantes; he is going to publish various scientific memoirs on the geology and the mollusks of Loire-Inférieure]. He is happy to have been able to admire "your beautiful collection of shells [...] At that time I wanted to add to my collection a rather considerable shipment so that I could show you my wealth. [...] I am sending you some shells from the coast of Brittany and some from Egypt. I suppose that you already have the major part of these shells they are common and I beg you to believe that I do not attach any value to them. You are rich in fossils; and you make me the offer to get me some if I could offer you something worthwhile I would like to be able to get the most kinds possible "...