Nor is the end yet. The eye of man, perhaps, is the most wonderful organ known; wonderful in its powers when unaided by instruments of man's invention, but rendered infinitely more powerful and wonderful when aided by telescope and microscope. Indeed, by these instruments new and unthought of worlds are brought to the consciousness of man, and his knowledge infinitely extended. Yet wonderful as is this organ of man, and great as are its achievements when aided by the instruments of man's invention, man's ingenuity has produced a more powerful eye than man's! One that can look longer and see farther than the human eye, even when aided by the most powerful telescope; and registers upon its retina truths otherwise unattainable by man. This instrument Camille Flammarion, the French astronomer and writer, calls "The Wonderful New Eye of Science." It is merely a lens connected with a photographic apparatus, and of it the writer just named says: This giant eye is endowed with four considerable advantages over ours; it sees more quickly, farther, longer; and, wonderful faculty, it receives and retains the impress of what it sees. It sees more quickly: in the half-thousandth of a second, it photographs the sun, its spots, its vortexes, its fires, its flaming mountains, and on an imperishable document. It sees farther: Directed towards any point of the heavens on the darkest night, it discerns stars in the depths of infinite space--worlds, universes, creations, that our eye could never see by the aid of any telescope. It sees longer: That which we cannot succeed in seeing in a few seconds of observation we shall never see. The photographic eyes has but to look long enough in order to see; at the end of half an hour it distinguishes what was before invisible to it; at the end of an hour it will see better still, and the longer it remains directed towards the unknown object, the better and more distinctly it will see it--and this without fatigue. And it retains on the retinal plate all that it has seen. [14]