“The labour of rising from the ground,” said the artist, “will be great, as we see it in the heavier domestic fowls; but as we mount higher the earth’s attraction and the body’s gravity will be gradually diminished, till we shall arrive at a region where the man shall float in the air without any tendency to fall; no care will then be necessary but to move forward, which the gentlest impulse will effect.  You, sir, whose curiosity is so extensive, will easily conceive with what pleasure a philosopher, furnished with wings and hovering in the sky, would see the earth and all its inhabitants rolling beneath him, and presenting to him successively, by its diurnal motion, all the countries within the same parallel.  How must it amuse the pendent spectator to see the moving scene of land and ocean, cities and deserts; to survey with equal security the marts of trade and the fields of battle; mountains infested by barbarians, and fruitful regions gladdened by plenty and lulled by peace.  How easily shall we then trace the Nile through all his passages, pass over to distant regions, and examine the face of nature from one extremity of the earth to the other.”

“All this,” said the Prince, “is much to be desired, but I am afraid that no man will be able to breathe in these regions of speculation and tranquillity.  I have been told that respiration is difficult upon lofty mountains, yet from these precipices, though so high as to produce great tenuity of air, it is very easy to fall; therefore I suspect that from any height where life can be supported, there may be danger of too quick descent.”

“Nothing,&