The Variation of Animals and Plants under DomesticationNote 34 — Chapter XVII · ON THE GOOD EFFECTS OF CROSSING, AND ON THE EVIL EFFECTS OF CLOSE INTERBREEDING.Reading edition‘The Poultry Book,’ by W. B. Tegetmeier, 1866, p. 79.◇Copy noteReturn to CHAPTER XVII. ON THE GOOD EFFECTS OF CROSSING, AND ON THE EVIL EFFECTS OF CLOSE INTERBREEDING.