U?bersicht der seit 1847 fortgesetzten Untersuchungen u?ber das von der Atmospha?re unsichtbar getragene reiche organische Leben. [Overview of the investigations continued since 1847 on the rich organic life that is invisibly carried by the atmosphere.]

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4to. (30 cm.) [4]1-149p. Illustrated with two fold-out tables and two fold-out plates of drawings. Decorative paper over leather spine with gilt letters on the spine. Wear to extremities with the corners rubbed and somewhat rounded, covers slightly soiled, leather spine has a small tear at the top but is otherwise intact, gilt letters bright, minor dampstain affecting the bottom of pages 93ff., but not affecting any text or illustrations, previous owners' signatures and rubber stamps on front free endpaper, fold out tables and illustrations in fine condition, else very good to near fine with no internal markings. No dust jacket as issued. Christian Gottfried Ehrenberg (1795 ? 1876) was a German naturalist, zoologist, comparative anatomist, geologist, and microscopist. He was a founder of the field of micropaleontology. Per the obverse of the title page, "Gelesen in der Akademie der Wissenschaften am 19. Januar 1871." Ehrenberg was appointed professor of medicine at Berlin University in 1827. In 1829 Ehrenberg accompanied Alexander von Humboldt through eastern Russia to the Chinese frontier. After his return he began to concentrate his studies on microscopic organisms, which until then had not been systematically studied. For nearly 30 years Ehrenberg examined samples of water, soil, sediment, blowing dust and rock and described thousands of new species, among them well-known flagellates such as Euglena, ciliates such as Paramecium aurelia and Paramecium caudatum, and many fossils, in nearly 400 scientific publications. He was particularly interested in a unicellular group of protists called diatoms, but he also studied, and named, many species of radiolaria, foraminifera and dinoflagellates. This treatise is the one of the many published fruits of Ehrenberg's scientific work. N° de ref. del artículo 009429

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