that the same Events will always follow from the same Causes. By this Principle, they become acquainted with the more obvious Properties of external Objects, and gradually, from their Birth, treasure up a Knowledge of the Nature of Fire, Water, Earth, Stones, Heights, Depths, &c. and of the Effects that result from their Operation. The Ignorance and Inexperience of the Young, is here plainly distinguishable from the Cunning and Sagacity of the Old, who have learnt, by long Observation, to avoid what hurt them, and to pursue what gave Ease or Pleasure. A Horse, that has been accustom'd to the Field, becomes acquainted with the proper Height, which he can leap, and will never attempt what exceeds his Force and Ability. An old Greyhound will trust the more fatiguing Part of the Chace to the younger, and will place himself so as to meet the Hare in her Doubles; nor are the Conjectures, which he forms on this Occasion founded on any Thing but his Observation and Experience.
This is still more evident from the Effects of Discipline and Education on all Animals, who, by the proper Application of Rewards and Punishments, may be taught any Course of Action, the most contrary to their natural Instincts and Propensities. Is it notExpe-
