"Theory of Ancestral Contributions in Heredity," handwritten manuscript by Karl Pearson, published in Proceedings of the Royal Society (vol. 81:547) (3)

1973. [handwritten] 3 all its components, suffered to be mated at random, to the next generation. I feel quite certain that if Mr. Darlishire makes the requisite crosses in due proportions, and does not weight with differential fertility, he will find that ancestry does matter. That it does matter is just as good a proof of Mendelianism as Mr. Darlishire's proof in the simpler case that it has not any effect. If he fails to find its influence, then he will have [obscured] refuted Mendelian theory. To illustrate my point take a population distribution which would follow from crossing two pure races with respecting dominant & recessive characters represented by the letters D and R. Suppose the hybrids to cross at random, then the population will remain absolutely stable with the permanent formula (DD) + 2(DR) + (RR) Now suppose this to crop[?] with itself or with (DD) + 2(DR) + (RR) [obscured] Table I gives the scheme of offspring with their parents. This population of 16 individuals of different types of parentage now crosses with itself. The result is a population of 256 individuals showing [end]