Regrets J. D. Hooker did not visit Berlin.

Describes legal difficulties of Ernst Dieffenbach.

Lists species of Infusoria found in dust samples. Discusses origin of Atlantic dust. Discusses Infusoria in cosmetic paint from Tierra del Fuego and Patagonian earth. Thanks CD for samples. Would like samples from sea-bed.

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.