The superhuman being, who does not require to eat or drink, or rest, who is always active, and incessantly sensible, has no need of sleep. Sleep is no more necessary for the reparation of his forces, than food for their creation. We know that man is deprived of one third of his existence, by the imperious necessity for sleep. A man who dies at thirty years of age, has in reality lived for twenty only; he has slept all the rest of the time! What a poor notion this conveys of the condition of man! Whence arises this need of sleep? It arises from the fact that our forces, impaired by their exercise, require inaction and motionlessness for their repair--this is attained in the kind of temporary death produced by the suspension of the greater portion of the vital action, in sleep. During sleep, man prepares and stores up the forces which he will require to expend during the ensuing period. He devotes the night to this physical reparation, as much in obedience to what he observes in all the other portions of creation, as in obedience to the customs of civilization. But it is probable that all the forces of the superhuman being are inexhaustible, and that they do not require sleep, which is one of the hardest conditions of human existence. Everything leads us to believe that perpetual wakefulness is the permanent state of the superhuman being, and that the word "sleep" would have no meaning for him. Darkness must be equally unknown to all those beings who float in the ethereal spaces. Our night and day are produced alternatively by the rotation of the earth upon her axis, a rotation which hides the sun from her view during one half of her revolution. This rotatory motion draws our atmosphere with it, but its influence extends no further, the ether which surmounts our atmosphere is not subject to it. That fluid mass remains motionless, while the earth and its atmosphere turn upon their axis. The superhuman beings, who, according to our ideas, inhabit the planetary ether, are not drawn into this motion. They behold the earth revolving beneath them, but, being placed outside its movements, they never lose sight of the radiant sun-star. Night, we repeat, is an accidental phenomenon, which belongs to the planets only, because they have a hemisphere now illumined, and then not illumined by the sun; but night is unknown to the remainder of the universe. The superhuman beings, who people the regions far above the planets, never lose sight of the sun, and their happy days pass in the midst of an ocean of light. Let us pass on to the consideration of the senses which these superhuman beings probably possess, premising: 1. That the superhuman being must be endowed with the same senses which we possess, but that those senses are infinitely more acute and exquisite than ours. 2. That he must possess special senses, unknown to us.