The tumult untumultuous! All on wing, The action of these great planetary bodies on each other, it surely cannot be denied,-leaves them separate identities, precisely as before; and it is a species of agency, so essential to the magnificent harmony of the system, that we cannot conceive it to have been interrupted, for a single moment, since the universe itself was formed. An action, therefore, has been constantly taking place on all the bodies in the universe, and consequently a difference of some sort produced,-which yet leaves their identities unaffected. But though the identity of the substance of the separate orbs is not affected by their mutual attractions, the state, or temporary physical character, of these orbs,-considered individually as one great whole,-must be affected, or it would be absurd to speak of their mutual agency at all; for action implies the sequence of a change of some sort, and there can be no action, therefore, where the substances continue precisely the same, and their state also precisely the same, as before the action. Accordingly, we find, on our own globe, that great changes of state, such as form the most striking of its regular visible phenomena, are produced by this distant operation. The waters of our ocean, for example, rise and fall,-and, therefore, must have altered states, or physical tendencies, in consequence of which they rise and fall, as there is no corresponding addition or subtraction of matter,―at regular intervals,—which it is in our power to predict with infallible accuracy, not because we can divine any loss of identity in the fluid mass, any internal change in its elementary composition, or the nature and varieties of the winds, which are to sweep along its surface,-but because we know well, at what hours, and in what relative situation, a certain great body, at the distance of some hundreds of thousands of miles, is to be passing along the heavens. If, then, the mere position of a distant heavenly body can cause the particles of our ocean to arrange themselves in a different configuration, from that in which they would otherwise have existed, and, therefore, must have produced in the particles that change of state, which forces them, as it were, into this altered form,-without addition to them of any thing, or subtraction of any thing,-in short, leaving in them the same absolute numerical or corpuscular identity as before, there surely can be no greater difficulty, in supposing, as in the case before imagined, that a certain position of the sun might have immediately caused the particles of a distant liquid, to arrange themselves in the particular configuration, that constitutes the solid ice,which, though perhaps a more striking change of state, would not have been more truly a change of state, than that which it now unquestionably produces, in modifying the rise or fall of our tides. And, if a distant body can produce in matter a change of state, without affecting its identity, by any addition or subtraction, we may surely admit, that the presence of an external body, as in perception, may, in mind also, produce a change of state, without affecting its identity; unless indeed, (which is not impossible, because nothing is impossible to human folly,) we should be inclined to reverse our prejudices, and maintain, that matter may be easily conceived to change the affinities or tendencies that form its physical character, in the particular circumstances observed, without any addition or subtraction of substance, but that some positive addition or subtraction of substance is, notwithstanding, essential to the simple changes or affections of the mind. If the moon were suddenly annihilated, our earth would still be the same identical planet, without the loss or gain of a single particle of substance. But the state of this planet, as a whole, and of every atom of this planet, would be instantly altered, in many most important respects, so completely altered, indeed, that not an atom of the mass would tend to the other atoms of the mass, in the same manner as before. In like manner, if the light,—— which now, operating on one of my organs of sense, causes my mind to exist in the state that constitutes the sensation of a particular colour,-were suddenly to vanish, the state of my mind would be instantly changed, though my mind itself, considered as a substance, would still continue unaltered. In both cases, the spiritual, and the material,-and in both cases, alike,-absolute identity, in the strictest sense of the term, is consistent with innumerable diversities. In the discussion of this supposed difficulty, I have chosen, for illustration, in the first place, to consider the planetary attractions, in preference to those which occur, in the minuter changes, that are simply terrestrial; because in the case of operations at a distance, it is impossible for us not to perceive, that, even in matter, a change of state is not inconsistent with complete permanence of absolute corpuscular identity; while, in the compositions or decompositions, that occur spontaneously, or by artificial experiment, in the physical changes on the surface of our earth, the additions or subtractions of matter, that appear to us to constitute these phenomena, truly destroy the corpuscular identity of the substances, in which the change takes place; and the change of state is thus considered by us, as implying a positive substantial change. But when we examine even these phenomena a little more deeply, we shall find, that, like the great operations of gravitation on the masses of the universe, the change, in these also, is not a positive change of substance, but is simply a change of state in a congeries of independent substances, which we term one substance, merely because the spaces, that are really between them, are imperceptible to our very imperfect organs; the addition or subtraction of matter being not that which constitutes the new states or tendencies of the particles which continue present, but merely that which gives occasion to those changes of state or tendency;-as the positions of the heavenly bodies do not constitute the phenomena of our tides, but merely give occasion to that difference of state in the particles of the ocean, in consequence of which they assume of themselves a different configuration. Man is placed, as it has been truly said, on a point, between two infinities,— the infinitely great, and the infinitely little. It may be an extravagant speculation, to which I have before alluded, but it is not absolutely absurd, to suppose, that in the unbounded system of nature, there may be beings, to whose vision the whole planetary attendants of each separate sun, which to us appear to revolve at distances so immense, may yet seem but one small cohesive mass, in the same manner, as to those animalculæ, whose existence and successive generations had been altogether unknown to man, till the microscope created them, as it were, to his feeble sight, and which, perhaps, are mighty animals compared with races of beings still more minute, that are constantly living in our very presence, and yet destined never to be known to us, those bodies, which to us seem one small cohesive mass, may appear separated by distances, relatively as great, as to us are those of the planets. That light, itself a body, should pass freely through a mass of solid crystal, is regarded by us as a sort of physical wonder; and yet it is far from impossible, that, between the atoms which compose this apparently solid mass, whole nations of living beings may be dwelling, and exercising their mutual works of peace or hostility; while perhaps, if philosophy can be exercised, in brains of such infinitesimal dimensions, in the same manner as in our coarser organs, the nature of the atoms, or distant worlds around them, may be dividing, with endless absurdities, the Ptolemies and Aristotles of the little republics. We have all so much of the nature of the inhabitants of Brobdignag, that a supposition of this kind,-which is perhaps truly in itself not a very probable one,-yet appears to us much more improbable than it really is. We smile, as recognising our own nature, when the sovereign of that country of giants is represented by the most unfortunate, or rather the most fortunate of all voyagers, as "turning to his first minister, who waited behind him with a white staff, near as tall as the mainmast of the Royal Sovereign, and observing how contemptible a thing was human grandeur, which could be mimicked by such diminutive insects.' "And yet," said he, "I dare engage, those creatures have their titles and distinctions of honour; they contrive their nests and burrows, that they call houses and cities; they make a figure in dress and equipage; they love, they fight, they dispute, they cheat, they betray." And we fully enter into the difficulty which the savans of the country, who had all agreed that the new-discovered animal could not have been produced according to the regular laws of nature, must have found, in giving him a name. "One of them seemed to think that I might be an embryo, or abortive birth. But this opinion was rejected by the other two, who observed my limbs to be perfect and finished; and that I had lived several years, as it was manifest from my beard, the stumps whereof they plainly discovered through a magnifying-glass. They would not allow me to be a dwarf, because my littleness was beyond all degrees of comparison; for the queen's favourite dwarf, the smallest ever known in that kingdom, was near thirty feet high. After much debate, they concluded unanimously, that I was only relplum scalcath, which is interpreted literally lusus naturæ ; a determination exactly agreeable to the modern philosophy of Europe, whose professors, disdaining the old evasion of occult causes, whereby the followers of Aristotle endeavoured in vain to disguise their ignorance, have invented this wonderful solution of all difficulties, to the unspeakable advancement of human knowledge.' Whatever may be thought of speculations of this kind, however, with respect to the relative distance of the atoms of bodies, it is not the less certain, that these atoms are separate substances, independent of the other similar or different substances that apparently adhere to them in continuity,that they are, in truth, the only material substances which really exist, since the bodies which we term masses are only those very atoms under another name, that they remain, and cannot but remain, identical, amid all the changes of chemical composition or decomposition, and that the change which they suffer, therefore, however strikingly their physical character may be altered for the time, is a change not of substance but of state only. In the case of the formation of ice, for example, the elementary atoms themselves, which are all that truly exist in nature, are not, and cannot be, changed; but particles, which were formerly easily separable from adjacent * Gulliver's Travels, part ii. chap. 3. particles, now resist this separation by a considerable force. There is a change in their state, therefore, since they now exist with a different degree of tendency toward each other, a change, to which the separation of a quantity of caloric may, indeed, have given occasion, but which is to be distinguished from that momentary separation itself, since the solidity which is only another name for the corpuscular resistance, continues after the separation is complete, and would continue for ever, unless a change of temperature were again to restore that former state or tendency of the particles, in which they were easily separable. To him who has learned to consider bodies as, what they truly are, a multitude of separate and independent corpuscles, there is no change of identity, and cannot be any change of identity, in all the phenomena or changes of the universe. The atoms, which alone existed, continue as before; and all which constitutes the phenomenon, or varieties of successive phenomena, is a change of their place or tendency. This corpuscular view of the material universe,-which, of course, admits an infinite variety of applications, corresponding with the infinite variety of its phenomena, has many most striking analogies in that moral universe, with the phenomena of which we are chiefly concerned. Indeed, when we consider any one of the masses before us, as deriving all its apparent magnitude from a number of separate bodies, of which it is composed,―any one of which, individually, would be too minute to be distinguishable by us,-it is scarcely possible not to think of the similarity which it presents to the multitudes of human beings that are, as it were, massed together in the great nations of the earth; and in which any single individual, if he could be supposed to have exercised his powers separately, would have been truly as insignificant as a single atom separated from the mass of which it is a part. What we call the greatness of a nation, is nothing more than the union of a number of little interests and little passions joined in one common object; to which insignificant elements, so wonderful when combined, if we could distinctly reduce, by analysis, the most unrivalled power that has ever commanded the admiration and envy of the world, it would, at first view, run some little risk of appearing contemptible. The advantages of this social union of mankind, as silently felt at every moment, are unquestionably so infinite in comparison, as almost to sink into nothing the occasional evils to which the aggregation and massing of so many powers, when ill directed, may give rise,-though these terrific evils, when they occur, may dwell more permanently in the mind;—like the visitations of storms and earthquakes, which we remember for ever, while, with a sort of thankless forgetfulness, we scarcely think of the calm beauty and regularity which, season after season, passes over us. The rock which, descending from the top of a mountain, lays waste whatever it meets in its progress, and to attempt to stop which, while its short career lasts, would be almost like instant annihilation,-derives this overwhelming force from an infinite number of independent corpuscles, any one of which, if it had fallen singly, would have been far less destructive than the flutter of an insect's wing; and that tyrannical power of a single man, before which, in unhappy ages of successful oppression, the earth has so often trembled, as before some power of darkness, endowed with more than human sway,-has derived its irresistible might, not from powers included in itself,-which, in reference to the objects achieved by it, would have been feeble indeed,-but from the united powers of beings still feebler, who were trembling while they executed commands, to which themselves alone gave omnipotence, To this corpuscular view, however, though it is unquestionably the sort of view to which, in our ultimate physical inquiries into the phenomena of matter, we must come, you may, perhaps, not be sufficiently accustomed, to enter fully into the reasoning on the subject. It will probably be less difficult for you, if we take rather, as an illustration, the simpler case of impulse; in which the bodies affecting each other are not, as in chemistry, indistinguishable corpuscles, but masses, clearly defined, and easily perceptible. I need not, of course, repeat the arguments formerly stated, to prove that attraction, however general it may be as a law of matter at all visible distances, does not continue, but gives place to an opposite tendency at those smaller distances, which we are unable to perceive with our weak organs, and which we learn to estimate only by effects that are inconsistent with absolute contact ;-for example, by the well-known fact of the compressibility of bodies, which could not take place if their particles were already in contact, and which, by continually increasing resistance to the compressing force that would bring the corpuscles nearer, shows, that there is, at different degrees of nearness, a tendency continuing to operate, which is the very reverse of attraction. There is, therefore, every reason to believe, since repulsion, as the fact of forcible compression shows, takes place while the particles of bodies are still at a certain distance, that the motion produced in one body by another, and ascribed to immediate impulse, is produced, without actual contact, by this mutual repulsion, as it is called, of the bodies when brought within a certain invisible degree of vicinity to each other; or, in other words,-for repulsion means nothing more mysterious than this simple fact,-the tendency which bodies, in certain relative positions of apparent but not actual contact, have to fly off from each other with certain degrees of velocity, as in certain other relative positions, of distinguishable distance, they have a tendency to approach each other. This repulsion, or tendency from each other at one point of nearness, is of itself as easy to be conceived, as that attraction, or tendency toward each other at other points of distance, to which we give the name of gravitation; and it is only from our greater familiarity with the one, as operating at distances which are visible, while the other, except in a few cases, such as those of magnetism and electricity,-operates only at distances which are imperceptible to us, that we feel a little more difficulty in admitting the repulsion than the attraction of matter. There is then, however universal gravitation may seem, when we think only of perceptible distances, a certain point of near approach, before actual contact, at which gravitation ceases; and, beyond this point, the tendency of bodies toward each other is converted, as the force necessary to compress them evidently shows,-into a tendency from each other; both tendencies, indeed, being inexplicable, but the one in no respect more so than the other. For this apparent digression, on a point of general physics, I make no apology, as it is absolutely necessary for illustrating the particular case to which I am to proceed. The consideration of it requires, what the whole of this discussion, indeed, has already required from you, no small exercise of patient attention; but I trust that I sufficiently prepared you for this in a former Lecture, when I stated the importance of such attention, not merely in relation to the subject considered at the time, but as a part of your mentaľ |