Mendelian inheritance
Similar work in America by Edward East on maize in 1910 showed the same thing for biologists without access to Nilsson-Ehle's work. On the same theme, the mathematician Ronald Fisher published "The Correlation Between Relatives on the Supposition of Mendelian Inheritance" in 1918, again showing that continuous variation could readily be produced by multiple Mendelian genes. It showed, too, that Mendelian inheritance had no essential link with mutationism: Fisher stressed that small variations (per gene) would be sufficient for natural selection to drive evolution.