 This eclipse of Darwinism (in Julian Huxley's phrase) grew out of the weaknesses in Darwin's account, written with an incorrect view of inheritance.Darwin himself believed in blending inheritance, which implied that any new variation, even if beneficial, would be weakened by 50% at each generation, as the engineer Fleeming Jenkin correctly noted in 1868.This in turn meant that small variations would not survive long enough to be selected.