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He published his Ein Besuch der Galápagos-Inseln, Sammlung von Vortraegen fuer das deutsche Volk (“A Visit to the Galápagos Islands: A Collection of Presentations for the German People”) in 1892. His observations also include notes on the human population on the islands.
He had performed a geologic survey of mainland Ecuador, but unfortunately his collections were lost in storage.[2]
Wolf’s observations, which became the standard interpretation of island geology, depicted the islands as exposed tops of oceanic volcanoes with a distinctly different composition from the volcanic mountains of South America.[3]
As a botanist he described or co-described numerous species within the genus Potentilla.[4]