806 - HUMBOLDT, Alexander von (1769–1859), German naturalist and explorer.

HUMBOLDT, Alexander von (1769–1859), German naturalist and explorer. Set of 2 documents addressed to his colleague, the geologist Jules DESNOYERS (1800–1887), a founding member of the Geological Society of France and the person who, in 1829, coined the term “Quaternary” to designate our most recent geological era: -An autograph letter written in the third person singular. No place, no date. “This Saturday” [March 1827, according to a note]. 1 p. in-12. “Mr. de Humboldt sends his warm regards to Mr. Desnoyers and reminds him [sic] of a book on volcanology that Dr. Daubeny assures him he sent to Paris. As Mr. de H. is obliged to leave for Germany shortly, he would be very pleased to take this book with him: perhaps Mr. Desnoyers himself has not yet returned from his important trip to England.” The British botanist, chemist, and geologist CHARLES DAUBENY (1795–1867), whom Humboldt had met a few years earlier, published several important works on volcanoes, their shared passion; in 1826: *A Description of Active and Extinct Volcanoes*; and in 1827: *Tabular View of Volcanic Phenomena*. -Autograph note. No place, no date [1824, according to a note]. Approximately 2 x 7.5 cm. “To Mr. Desnoyers, asking him to kindly share with Mr. Humboldt some critical observations on his book.”