former, is, that the human species itself is capable of a similar and unbounded improvement; whereby mankind in a later age are greatly superior to mankind in a former age, the individuals being taken at the same time of life. Of this progress of the species, brute animals are more incapable than they are of that relating to individuals. No horse of this age seems to have any advantage over other horses of former ages; and if there be any improvement in the species, it is owing to our manner of breeding and training them. But a man at this time, who has been tolerably well educated, in an improved christian country, is a being possessed of much greater power, to be, and to make happy, than a person of the same age, in the same, or any other country, some centuries ago. And, for this reason, I make no doubt, that a person some centuries hence will, at the same age, be as much superior to us.
The great instrument in the hand of divine providence, of this progress of the
