[...]first steps toward civilization, they begin, in the one case, by taming animals, and rearing them in flocks and herds; and, in the other case, by saving the seeds of food-producing plants, and cultivating them by artificial tillage in inclosed and private fields. This last is the condition of all the half-civilized tribes of the tropical regions of the earth, whereas the former prevails in all the rthern temperate and arctic regions, as far to the rthward as domesticated animals can live.[...].