Karl Wilhelm von Nägeli

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Karl Wilhelm von Nägeli (March 27, 1817 - May 11, 1891) was a Swiss botanist. He discovered what would later become known as chromosomes.

Nägeli was born in Kilchberg near Zurich where he studied medicine. From 1839, he studied botany under A. P. de Candolle at Geneva, and graduated with a botanical thesis at Zurich in 1840. His attention having been directed by Matthias Jakob Schleiden, then professor of botany at Jena, to the microscopical study of plants, he engaged more particularly in that branch of research. Soon after graduation he became Privatdozent and subsequently professor extraordinary, in the university of Zurich; in 1852 he was called to fill the chair of botany in the Albert Ludwigs University of Freiburg, Freiburg im Breisgau; and in 1857 he was promoted to Munich, where he remained as professor until his death.

Among his more important contributions to science were a series of papers in the Zeitschrift fur wissenschaftliche Botanik (1844 1846); Die neueren Algensysteme (1847); Gattungen einzelliger Algen (1849); Pflanzenphysiologische Untersuchungen (1855 1858), with Carl Eduard Cramer; Beiträge zur wissenschaftlichen Botanik (1858-1868); a number of papers contributed to the Royal Bavarian Academy of Sciences, forming three volumes of Botanische Mitteilungen (1861-1881); and, finally, his volume, Mechanisch-physiologische Theorie der Abstammungslehre[scanned source], published in 1884. However, perhaps he is best known nowadays for his unproductive correspondence (1866-1873) with Gregor Mendel concerning the latter's celebrated work on Pisum sativum, the garden pea.