Carl Nägeli, Swiss botanist and mycologist (born 1817)

Carl Wilhelm von Nägeli was a Swiss botanist. He studied cell division and pollination but became known as the man who discouraged Gregor Mendel from further work on genetics. He rejected natural selection as a mechanism of evolution, favouring orthogenesis driven by a supposed "inner perfecting principle".

May 10 is the 130th day of the year in the Gregorian calendar; 235 days remain until the end of the year.