Johannes Lachmann

Johannes Lachmann
around 1858

Karl Friedrich Johannes Lachmann (born August 1, 1832 in Braunschweig , † July 7, 1860 in Bonn ) was a German agricultural botanist .

Life

Lachmann was the son of the biologist Heinrich Lachmann , he studied natural sciences at the University of Göttingen and received his doctorate in 1855 at the Medical Faculty of the University of Berlin . From 1857 he was a lecturer in botany, zoology and mineralogy at the agricultural college in Poppelsdorf near Bonn .

Lachmann was a student of Johannes Müller and the first to recognize the nodules of legumes as bacteria-like, physiologically important organs. He suspected that these nodules cause the nitrogen enrichment of the soil observed after the cultivation of legumes. His publication under the title Ueber Knollen on the roots of the leguminous plants , which appeared in 1858 in the “house communications” of the Bonn agricultural educational institute, was ignored. Lachmann died in 1860. Only after Hermann Hellriegel had experimentally proven the biological nitrogen fixation by bacteria in 1886 , Lachmann's contribution from 1858 was rediscovered and reprinted again in 1891 in Biedermann's Central-Blatt für Agrikulturchemie .

Lachmann was accepted into the Masonic lodge " Carl zur crowned column " in Braunschweig in 1851 .

publication

• About tubers on the roots of legumes. In: Landwirthschaftliche Mittheilungen. Journal of the Royal Higher Agricultural Training Institute and the associated agricultural experimental station in Poppelsdorf. Wiegand & Hempel, Berlin 1858, OCLC 310954181 . Issue 1, pp. 34-52. (= Biedermanns Central-Blatt for Agricultural Chemistry and Rational Farming. Vol. 20, 1891, pp. 837–854.)
• with René-Édouard Claparède: Études sur les infusoires et les rhizopodes. (German: About Infusorien and Rhizopoden ) Kessmann, Geneva 1858–61, OCLC 16156462 .

literature

• Hermann Ulrich: On the history of botany in Bonn . In: 150 Years of the Rheinische Friedrich-Wilhelms-Universität zu Bonn 1818–1968. Bonn scholars. Contributions to the history of science in Bonn. Agricultural Sciences. Bouvier Verlag and Ludwig Röhrscheid Verlag, Bonn 1971, pp. 71–80.

Individual evidence

1. ^ J. Pagel, Karl Sudhoff: Introduction to the history of medicine, in 25 academic lectures. Karger, Berlin 1915, OCLC 29161217 , p. 392 ( online ( memento of the original from July 8, 2015 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove it Note. ).