This blessing of nature, refused to man, assuredly belongs to the superhuman being. We may conclude also that the evil passions, which are a sad attribute of our species, would be unknown in the home of these privileged creatures. Released from the toil of seeking their food, living and repairing their functions by the mere effect of respiration--an involuntary and unconscious act (as the circulation of the blood and absorption are unconscious acts in men and animals)--the inhabitants of the ethereal spaces must be able to abandon themselves exclusively to impressions of unmixed happiness and serenity. The forces of our body become rapidly exhausted; we cannot exercise our functions for a certain time without experiencing fatigue. In order to transport ourselves from one place to another, to carry burthens, to go up or down any height, to walk, we are obliged to expend these forces, and lassitude immediately ensues. We cannot exercise the faculty of thought for more than a certain time. At the end of a short period attention fails, and thought is suspended. In short, our corporeal machine, beautifully ordered, is subject to a thousand derangements, which we call diseases. From the sense of fatigue, from the continual menace of illness by organic derangement, the dwellers in the ether are free. Rest is not for them, as for us, a necessity ensuing on exercise. The body of the superhuman being, inaccessible to fatigue, does not need repose. Unembarrassed by the mechanism of a complicated machine, it subsists and sustains itself by the unaided force of the life which animates it. Its sole physiological function, probably, is the inhalation of ether, a function which, it is easy to conceive, may be exercised without the aid of numerous organs, if we see a whole class of animals--the Batrachian--for whose respiration the bare and simple skin suffices.