But with the possession of reason there also goes the possession of what we call mental faculties. Not only can man by the use of his reason obtain food, provide for his safety, and continue his race, but higher ends are made possible for him, to be attained to by the use of this higher endowment. Man has the power of articulate speech, and upon this follows the power of learning to read, to write, and to cypher; and upon the power of doing these three things follows a plenitude of other powers. Now, I shall not stop to enquire how man gained these powers, whether by natural and sexual selection or not; but I venture to point out that there is a vast chasm between physical and intellectual powers. The most sensible monkey is a parody rather than an imitation of man, and the difference between the two is enormous.[25] The points of agreement serve rather to enable us to measure this interval, and see how wide it is, than to bridge it over. Now, let us suppose ourselves philosophers come, we will say, from the planet Jupiter, on a mission intrusted to us by the Jovians, to examine and report upon the nature of the creatures which people the four inferior planets, Terra, Venus, Mercury, and Mars. Of course, we should look upon the inhabitants of such small communities with contempt, but, being philosophers, we should not neglect anything because it was trifling. Well, when we came to Terra we should report that it was a very curious region, inhabited by a long scale of beings, each one fitted to its place, and that at their head there was a rather noxious, troublesome, and uppish creature called man, whose examination had caused us an infinity of trouble.