Painters who, like Raphael, represent the angel by the head of a child, with wings, give a far more profound expression to the same thought. By suppressing the larger portion of the body, and reducing the seraphic being to the head, the seat of intelligence, they indicate that in the angel of the Christian belief the spiritual dominates, in immense proportion, over the material part.
We shall not be expected to delineate the form of the dwellers in the realms of ether. We can only say, that, as ether is an excessively subtle and rarefied fluid, it necessarily follows that the superhuman being who is to float and fly in its light masses, must be wonderfully light, must be composed of extraordinary subtle substances. A slight material tissue, animated by life, a vaporous, diaphanous drapery of living matter, such do we represent the superhuman being to our fancy.
How is this body supported? Does it need food for its maintenance, like the bodies of men and of animals? We may reply with confidence that food--that tyrannous obligation of the human and the animal species--is spared to the inhabitants of the planetary ether. Their bodies must be supported and refreshed by mere respiration of the fluid in which they exist.
Let us consider the immense space occupied in the lives of animals by their need of alimentation. Many animals, especially those which live in the water, have an incessant need of food. They must eat always, without intermission, or they die of inanition. Among superior animals, the necessity for eating and drinking is less imperious, because the respiratory function comes to their aid, bringing into the body, by the absorption of oxygen and a small proportion of azote, a certain amount of reparative element, as a supplement to alimentary substances. Man profits largely by this advantage. Our respiration is a function of the highest importance, and it bears a great share in the reparation of all our organs. The oxygen which our blood borrows from the air in breathing, contributes largely to our nutrition. The respiratory function in birds is very active, and the organs which exercise it are largely developed, and in their nutrition also oxygen counts largely, and takes the place of a certain quantity of food.