. . . Quocunque volent animum auditoris agunto. HOR.
[Horace, Ars Poetica. 1OO: And take men’s spirits where they will. ]
As the writers in poetry and fiction borrow their several materials from outward objects, and join them together at their own pleasure, there are others who are obliged to follow Nature more closely, and to take entire scenes out of her. Such are historians, natural philosophers, travelers, geographers, and, in a word, all who describe visible objects of a real existence.
It is the most agreeable talent of an historian, to be able to draw up his armies and fight his battles in proper expressions, to set before our eyes the divisions, cabals, and jealousies of great men, and to lead us step by step into the several actions and events of his history. We love to see the subject unfolding itself by just degrees, and breaking upon us insensibly, that so we may be kept in a pleasing suspense, and have time given us to raise our expectations, and to side with one of the parties concerned in the relation. I confess this shows more the art than the veracity of the historian, but I am only to speak of him as he is qualified to please the imagination. And in this respect Livy has perhaps excelled all who went before him, or have written since his time. He describes everything in so lively a manner, that his whole history is an admirable picture, and touches on such proper circumstances in every story, that this reader becomes a kind of spectator, and feels in himself all the variety of passions which are correspondent to the several parts of the relation.
But among this set of writers there are none who more gratify and enlarge the imagination than the authors of the new philosophy, whether we consider their theories of the earth or heavens, the discoveries they have made by glasses, or any other of their contemplations on nature. We are not a little pleased to find every green leaf swarm with millions of animals that at their largest growth are not visible to the naked eye. There is something very engaging to the fancy, as well as to our reason, in the treatises of metals, minerals, plants, and meteors; but when we survey the whole earth at once, and the several planets that lie within its neighborhood, we are filled with a pleasing astonishment, to see so many worlds hanging one above another, and sliding round their axles in such an amazing pomp and solemnity. If after this we contemplate those wide fields of ether, that reach in height as far as from Saturn to the fixed stars, and run abroad almost to an infinitude, our imagination finds its capacity filled with so immense a prospect, and puts itself upon the stretch to comprehend it. But if we yet rise higher, and consider the fixed stars as so many vast oceans of flame, that are each of them attended with a different set of planets, and still discover new firmaments and new lights, that are sunk farther in those unfathomable depths of ether, so as not to be seen by the strongest of our telescopes, we are lost in such a labyrinth of suns and worlds, and confounded with the immensity and magnificence of Nature.
Nothing is more pleasant to the fancy, than to enlarge itself, by degrees, in its contemplation of the various proportions which its several objects bear to each other, when it compares the body of man to the bulk of the whole earth, the earth to the circle it describes round the sun, that circle to the sphere of the fixed stars, the sphere of the fixed stars to the circuit of the whole creation, the whole creation itself to the infinite space that is everywhere diffused about it; or when the imagination works downward, and considers the bulk of a human body, in respect of an animal a hundred times less than a mite, the particular limbs of such an animal, the different springs which actuate the limbs, the spirits which set these springs a-going, and the proportionable minuteness of these several parts, before they have arrived at their full growth and perfection. But if, after all this, we take the least particle of these animal spirits, and consider its capacity of being wrought into a world, that shall contain within those narrow dimensions a heaven and earth, stars and planets, and every different species of living creatures, in the same analogy and proportion they bear to each other in our own universe; such a speculation, by reason of its nicety, appears ridiculous to those who have not turned their thoughts that way, though, at the same time, it is founded on no less than the evidence of a demonstration. Nay, we might yet carry it farther, and discover in the smallest particle of this little world, a new inexhausted fund of matter, capable of being spun out into another universe.
I have dwelt the longer on this subject, because I think it may show us the proper limits, as well as the defectiveness, of our imagination; how it is confined to a very small quantity of space, and immediately stopped in its operations, when it endeavors to take in anything that is very great, or very little. Let a man try to conceive the different bulk of an animal which is twenty, from another which is a hundred times less than a mite, or to compare, in his thoughts, a length of a thousand diameters of the earth with that of a million, and he will quickly find that he has no different measures in his mind, adjusted to such extraordinary degrees of grandeur or minuteness. The understanding, indeed, opens an infinite space on every side of us, but the imagination, after a few faint efforts, is immediately at a stand, and finds herself swallowed up in the immensity of the void that surrounds it. Our reason can pursue a particle of matter through an infinite variety of divisions, but the fancy soon loses sight of it, and feels in itself a kind of chasm, that wants to be filled with matter of a more sensible bulk. We can neither widen nor contract the faculty to the dimensions of either extreme. The object is too big for our capacity, when we would comprehend the circumference of a world, and dwindles into nothing, when we endeavor after the idea of an atom.
It is possible this defect of imagination may not be in the soul itself, but as it acts in conjunction with the body. Perhaps there may not be room in the brain for such a variety of impressions, or the animal spirits may be incapable of figuring them in such a manner, as is necessary to excite so very large or very minute ideas. However it be, we may well suppose that beings of a higher nature very much excel us in this respect, as it is probable the soul of man will be infinitely more perfect hereafter in this faculty, as well as in all the rest; insomuch that, perhaps, the imagination will be able to keep pace with the understanding, and to form in itself distinct ideas of all the different modes and quantities of space.