CHAPTER 11.
Start on journey to Segovia.—Rocky mountain road.—A poor lodging. —The rock of Cuapo.—The use of large beaks in some birds. —Comoapa.—A native doctor.—Vultures.—Flight of birds that soar. —Natives live from generation to generation on the same spot.—Do not give distinctive names to the rivers.—Caribs barter guns and iron pots for dogs.—The hairless dogs of tropical America. —Difference between artificial and natural selection.—The cause of sterility between allied species considered.—The disadvantages of a covering of hair to a domesticated animal in a tropical country.