The French protistologist Edouard Chatton, the mentor and long time colleague of A. Lwoff, mentioned for the first time in 1925 the two categories prokaryotes and eukaryotes but only to distinguish prokaryotic from eukaryotic protists. However, his proposal did not become generally known. Later on, A. Lwoff propagated this distinction and finally convinced R. Stanier, together with C.B. van Niel in 1962, to describe a detailed and well-accepted division of prokaryotic (bacteria) and eukaryotic (animals, plants) organisms