Part 1, Chapter 6 -- The Unanswered Challenge: "Dr. Saleeby did me the honour of referring to me in one of his addresses on this subject, and said that even I cannot produce any but a feeble-minded child from a feeble-minded ancestry. To which I reply, first of all, that he cannot produce a feeble-minded child. The whole point of our contention is that this phrase conveys nothing fixed and outside opinion."