Sends samples likely to contain Infusoria and some that Hooker collected in Antarctic regions.

Astonished that dust sample contains Infusoria. Thinks dust is volcanic. Will write account of falling dust [see 775]. Offers further samples.

Has at last received first letter CGE wrote.

More specimens being sent.

Sends his sketch of paper ["Fine dust in the Atlantic Ocean" (1846), Collected papers 1: 199–203].

D’Orbigny considers Pampas clay deposit result of debacle. CD cannot doubt it is slow, estuary deposit. Would be grateful for information on this point.

Would like sketch returned [see 775].

Would be particularly thankful for result of CGE’s observations on earth of Pampas.

Asks that Ernst Dieffenbach return copperplate and woodcuts.

Cannot doubt that Atlantic dust comes from Africa. Could Gulf Stream have brought South American organisms to African coast?

Has come to same conclusion as CGE on volcanic origin of Patagonian stone. Formation extends 550 miles.

Could CGE examine Pampas mud to see if Infusoria are freshwater or salt-water? Results would be important.

Sends small specimens for CGE to examine if he wishes.

Thanks CGE for his letter on Atlantic Dust: CD hopes to send a little paper to the Geological Society of London.

If CGE should examine Pampæan mud, CD would like to know the result.

CGE’s account of Pampas mud confirms CD’s view of its origin. Will send Patagonian specimens. Discusses dust-carrying winds in the Atlantic.

Was not referring to F. J. F. Meyen’s voyage.

Corrects error concerning samples.

Sends specimens. Asks for information about specimens from Rio Gallegos.

What does CGE mean by the term "Fluthgebiete"?

French translation gives impression that Ehrenberg attributes Pampas deposit to debacle.

Sends copy [of "Fine dust in the Atlantic Ocean", Collected papers 1: 199–202]. Attempting to obtain further samples for CGE.

Thanks CGE for two papers and for his assistance of many years ago.

Thanks CGE for memoir on the Bacillariae of Mexico [Abh. K. Akad. Wiss. Berlin (Phys.) (1869): 1–66].

Thanks CGE for gift of his latest work [Mikrogeologische Studien (1873)].