Synthesized answer
The provided passages do not contain information about the specific evidence Alexander von Humboldt provides in "Kosmos: Entwurf einer physischen Weltbeschreibung." The passages only state the title and author of the work. Therefore, it is not possible to answer what evidence the author provides based on the given text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Kosmos, Entwurf einer physischen Weltbeschreibung, von Alexander von Humboldt by Alexander von Humboldt