95% sureThese words were traced back to where they first appeared. That source is listed below.
What turned up
Letters of Alexander von Humboldt to Varnhagen von Ense, trans. Friedrich Kapp (Rudd & Carleton, 1860; Gutenberg #67420). Letter 54, Humboldt to Varnhagen, April 28, 1841.
Work
Letters to Varnhagen von Ense
Occasion
1841 · describing how his book Kosmos mixes precise science with wonder at the night sky
Sources checked
gutenberg.orgChecked using claude-sonnet-5, 21 August 2026Kapp translation, Letters of Alexander von Humboldt to Varnhagen von Ense; letter of April 28, 1841 describing the style of Kosmos
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