Chapter 3

As a hint for apprehending the delicacy and difficulty of the process in sidereal astronomy, let the inexperienced reader figure to himself these separate cases of perplexity: 1st, A perplexity where the dilemma arises from the collision between magnitude and distance:--is the size less, or the distance greater? 2dly, Where the dilemma arises between motions, a motion in ourselves doubtfully confounded with a motion in some external body; or, 3dly, Where it arises between possible positions of an object: is it a real proximity that we see between two stars, or simply an apparent proximity from lying in the same visual line, though in far other depths of space? As regards the first dilemma, we may suppose two laws, A and B, absolutely in contradiction, laid down at starting: A, that all fixed stars are precisely at the same _distance_; in this case every difference in the apparent magnitude will indicate a corresponding difference in the real magnitude, and will measure that difference. B, that all the fixed stars are precisely of the same _magnitude_; in which case, every variety in the size will indicate a corresponding difference in the distance, and will measure that difference. Nor could we imagine any exception to these inferences from A or from B, whichever of the two were assumed, unless through optical laws that might not equally affect objects under different circumstances; I mean, for instance, that might suffer a disturbance as applied under hypoth. B, to different depths in space, or under hypoth. A, to different arrangements of structure in the star. But thirdly, it is certain, that neither A nor B is the abiding law: and next it becomes an object by science and by instruments to distinguish more readily and more certainly between the cases where the distance has degraded the size, and the cases where the size being _really_ less, has caused an exaggeration of the distance: or again, where the size being really less, yet co-operating with a distance really greater, may degrade the estimate, (though travelling in a right direction,) below the truth; or again where the size being really less, yet counteracted by a distance also less, may equally disturb the truth of human measurements, and so on.

A second large order of equivocating appearances will arise,--not as to magnitude, but as to motion. If it could be a safe assumption, that the system to which our planet is attached were absolutely fixed and motionless, except as regards its own _internal_ relations of movement, then every change outside of us, every motion that the registers of astronomy had established, would be objective and not subjective. It would be safe to pronounce at once that it was a motion in the object contemplated, _not_ in the subject contemplating. Or, reversely, if it were safe to assume as a universal law, that no motion was possible in the starry heavens, then every change of relations in space, between ourselves and them, would indicate and would measure a progress, or regress, on the part of our solar system, in certain known directions. But now, because it is not safe to rest in either assumption, the range of possibilities for which science has to provide, is enlarged; the immediate difficulties are multiplied; but with the result (as in the former case) of reversionally expanding the powers, and consequently the facilities, lodged both in the science and in the arts ministerial to the science. Thus, in the constellation _Cygnus_, there is a star gradually changing its relation to our system, whose distance from ourselves (as Dr. Nichol tells us) is ascertained to be about six hundred and seventy thousand times our own distance from the sun: that is, neglecting minute accuracy, about six hundred and seventy thousand stages of one hundred million miles each. This point being known, it falls within the _arts_ of astronomy to translate this apparent angular motion into miles; and presuming this change of relation to be not in the star, but really in ourselves, we may deduce the velocity of our course, we may enter into our _log_ daily the rate at which our whole solar system is running. Bessel, it seems, the eminent astronomer who died lately, computed this velocity to be such (viz., three times that of our own earth in its proper orbit) as would carry us to the star in forty-one thousand years. But, in the mean time, the astronomer is to hold in reserve some small share of his attention, some trifle of a side-glance, now and then, to the possibility of an error, after all, in the main assumption: he must watch the indications, if any such should arise, that not ourselves, but the star in _Cygnus_, is the real party concerned, in drifting at this shocking rate, with no prospect of coming to an anchorage. [Footnote: It is worth adding at this point, whilst the reader remembers without effort the numbers, viz., forty-one thousand years, for the time, (the space being our own distance from the sun repeated six hundred and seventy thousand times,) what would be the time required for reaching, in the _body_, that distance to which Lord Rosse's six feet mirror has so recently extended our _vision_. The time would be, as Dr. Nichol computes, about two hundred and fifty millions of years, supposing that our rate of travelling was about three times that of our earth in its orbit. Now, as the velocity is assumed to be the same in both cases, the ratio between the distance (already so tremendous) of Bessel's 61 _Cygni_, and that of Lord Rosse's farthest frontier, is as forty- one thousand to two hundred and fifty millions. This is a simple rule- of-three problem for a child. And the answer to it will, perhaps, convey the simplest expression of the superhuman power lodged in the new telescope:--as is the ratio of forty-one thousand to two hundred and fifty million, so is the ratio of our own distance from the sun multiplied by six hundred and seventy thousand, to the outermost limit of Lord Rosse's sidereal vision.]

Another class, and a frequent one, of equivocal phenomena, phenomena that are reconcilable indifferently with either of two assumptions, though less plausibly reconciled with the one than with the other, concerns the position of stars that seem connected with each other by systematic relations, and which yet _may_ lie in very different depths of space, being brought into seeming connection only by the human eye. There have been, and there are, cases where two stars dissemble an interconnection which they really _have_, and other cases where they simulate an interconnection which they have not. All these cases of simulation and dissimulation torment the astronomer by multiplying his perplexities, and deepening the difficulty of escaping them. He cannot get at the truth: in many cases, magnitude and distance are in collusion with each other to deceive him: motion subjective is in collusion with motion objective; duplex systems are in collusion with fraudulent stars, having no real partnership whatever, but mimicking such a partnership by means of the limitations or errors affecting the human eye, where it can apply no other sense to aid or to correct itself. So that the business of astronomy, in these days, is no sinecure, as the reader perceives. And by another evidence, it is continually becoming less of a sinecure. Formerly, one or two men,-- Tycho, suppose, or, in a later age, Cassini and Horrox, and Bradley, had observatories: one man, suppose, observed the stars for all Christendom; and the rest of Europe observed _him_. But now, up and down Europe, from the deep blue of Italian skies to the cold frosty atmospheres of St. Petersburg and Glasgow, the stars are conscious of being watched everywhere; and if all astronomers do not publish their observations, all use them in their speculations. New and brilliantly appointed observatories are rising in every latitude, or risen; and none, by the way, of these new-born observatories, is more interesting from the circumstances of its position, or more _picturesque_ to a higher organ than the eye--viz., to the human heart--than the New Observatory raised by the university of Glasgow.[Footnote: It has been reported, ever since the autumn of 1845, and the report is now, (August, 1846,) gathering strength, that some railway potentate, having taken a fancy for the ancient college of Glasgow, as a bauble to hang about his wife's neck, (no accounting for tastes,) has offered, (or _will_ offer,) such a price, that the good old academic lady in this her moss-grown antiquity, seriously thinks of taking him at his word, packing up her traps, and being off. When a spirit of galavanting comes across an aged lady, it is always difficult to know where it will stop: so, in fact, you know, she may choose to steam for Texas. But the present impression is, that she will settle down by the side of what you may call her married or settled daughter--the Observatory; which one would be glad to have confirmed, as indicating that no purpose of pleasure-seeking had been working in elderly minds, but the instinct of religious rest and aspiration. The Observatory would thus remind one of those early Christian anchorites, and self-exiled visionaries, that being led by almost a necessity of nature to take up their residence in deserts, sometimes drew after themselves the whole of their own neighborhood.]

The New Observatory of Glasgow is now, I believe, finished; and the only fact connected with its history that was painful, as embodying and recording that Vandal alienation from science, literature, and all their interests, which has ever marked our too haughty and Caliph-Omar- like British government, lay in the circumstance that the glasses of the apparatus, the whole mounting of the establishment, in so far as it was a scientific establishment, and even the workmen for putting up the machinery, were imported from Bavaria. We, that once bade the world stand aside when the question arose about glasses, or the graduation of instruments, were now literally obliged to stand cap in hand, bowing to Mr. Somebody, successor of Frauenhofer or Frauendevil, in Munich! Who caused _that_, we should all be glad to know, if not the wicked Treasury, that killed the hen that laid the golden eggs by taxing her until her spine broke? It is to be hoped that, at this moment, and specifically for this offence, some scores of Exchequer men, chancellors and other rubbish, are in purgatory, and perhaps working, with shirt-sleeves tucked up, in purgatorial glass-houses, with very small allowances of beer, to defray the cost of perspiration. But why trouble a festal remembrance with commemorations of crimes or criminals? What makes the Glasgow Observatory so peculiarly interesting, is its position, connected with and overlooking so vast a city, having more than three hundred thousand inhabitants, (in spite of an American sceptic,) nearly all children of toil; and a city, too, which, from the necessities of its circumstances, draws so deeply upon that fountain of misery and guilt which some ordinance, as ancient as 'our father Jacob,' with his patriarchal well for Samaria, has bequeathed to manufacturing towns,--to Ninevehs, to Babylons, to Tyres. How tarnished with eternal canopies of smoke, and of sorrow; how dark with agitations of many orders, is the mighty town below! How serene, how quiet, how lifted above the confusion and the roar, how liberated from the strifes of earth, is the solemn Observatory that crowns the grounds above! And duly, at night, just when the toil of over-wrought Glasgow is mercifully relaxing, then comes the summons to the laboring astronomer. _He_ speaks not of the night, but of the day and the flaunting day-light, as the hours 'in which no man can work.' And the least reflecting of men must be impressed by the idea, that at wide intervals, but intervals scattered over Europe, whilst 'all that mighty heart' is, by sleep, resting from its labors, secret eyes are lifted up to heaven in astronomical watch-towers; eyes that keep watch and ward over spaces that make us dizzy to remember, eyes that register the promises of comets, and disentangle the labyrinths of worlds.

Another feature of interest, connected with the Glasgow Observatory, is personal, and founded on the intellectual characteristics of the present professor, Dr. Nichol; in the deep meditative style of his mind seeking for rest, yet placed in conflict for ever with the tumultuous necessity in _him_ for travelling along the line of revolutionary thought, and following it loyally, wearied or not, to its natural home.

In a sonnet of Milton, one of three connected with his own blindness, he distinguishes between two classes of servants that minister to the purposes of God. '_His_ state,' says he, meaning God's state, the arrangement of his regular service, 'is kingly;' that is to say, it resembles the mode of service established in the courts of kings; and, in this, it resembles that service, that there are two classes of ministers attending on his pleasure. For, as in the trains of kings are some that run without resting, night or day, to carry the royal messages, and also others--great lords in waiting--that move not from the royal gates; so of the divine retinues, some are for action only, some for contemplation. 'Thousands' there are that

----'at his bidding speed, And post o'er land and ocean without rest.'

Others, on the contrary, motionless as statues, that share not in the agitations of their times, that tremble not in sympathy with the storms around them, but that listen--that watch--that wait--for secret indications to be fulfilled, or secret signs to be deciphered. And, of this latter class, he adds-that they, not less than the others, are accepted by God; or, as it is so exquisitely expressed in the closing line,

'_They_ also serve, that only stand and wait.'

Something analogous to this one may see in the distributions of literature and science. Many popularize and diffuse: some reap and gather on their own account. Many translate, into languages fit for the multitude, messages which they receive from human voices: some listen, like Kubla Khan, far down in caverns or hanging over subterranean rivers, for secret whispers that mingle and confuse themselves with the general uproar of torrents, but which can be detected and kept apart by the obstinate prophetic ear, which spells into words and ominous sentences the distracted syllables of ærial voices. Dr. Nichol is one of those who pass to and fro between these classes; and has the rare function of keeping open their vital communications. As a popularizing astronomer, he has done more for the benefit of his great science than all the rest of Europe combined: and now, when he notices, without murmur, the fact that his office of popular teacher is almost taken out of his hands, (so many are they who have trained of late for the duty,) that change has, in fact, been accomplished through knowledge, through explanations, through suggestions, dispersed and prompted by himself.

For my own part, as one belonging to the laity, and not to the _clerus_, in the science of astronomy, I could scarcely have presumed to report minutely, or to sit in the character of dissector upon the separate details of Dr. Nichol's works, either this, or those which have preceded it, had there even been room left disposable for such a task. But in this view it is sufficient to have made the general acknowledgment which already _has_ been made, that Dr. Nichol's works, and his oral lectures upon astronomy, are to be considered as the _fundus_ of the knowledge on that science now working in this generation. More important it is, and more in reconciliation with the tenor of my own ordinary studies, to notice the philosophic spirit in which Dr. Nichol's works are framed; the breadth of his views, the eternal tendency of his steps in advance, or (if advance on that quarter, or at that point, happens to be absolutely walled out for the present,) the vigor of the _reconnoissances_ by which he examines the hostile intrenchments. Another feature challenges notice. In reading astronomical works, there arises (from old experience of what is usually most faulty) a wish either for the naked severities of science, with a total abstinence from all display of enthusiasm; or else, if the cravings of human sensibility are to be met and gratified, that it shall be by an enthusiasm unaffected and grand as its subject. Of that kind is the enthusiasm of Dr. Nichol. The grandeurs of astronomy are such to him who has a capacity for being grandly moved. They are none at all to him who has not. To the mean they become meannesses. Space, for example, has no grandeur to him who has no space in the theatre of his own brain. I know writers who report the marvels of velocity, &c., in such a way that they become insults to yourself. It is obvious that in _their_ way of insisting on our earth's speed in her annual orbit, they do not seek to exalt _her_, but to mortify _you_. And, besides, these fellows are answerable for provoking people into fibs:--for I remember one day, that reading a statement of this nature, about how many things the Earth had done that we could never hope to do, and about the number of cannon balls, harnessed as a _tandem_, which the Earth would fly past, without leaving time to say, _How are you off for soap?_ in vexation of heart I could not help exclaiming--'That's nothing: I've done a great deal more myself;' though, when one turns it in one's mind, you know there must be some inaccuracy _there_. How different is Dr. Nichol's enthusiasm from this hypocritical and vulgar wonderment! It shows itself not merely in reflecting the grandeurs of his theme, and by the sure test of detecting and allying itself with all the indirect grandeurs that arrange themselves from any distance, upon or about that centre, but by the manifest promptness with which Dr. Nichol's enthusiasm awakens itself upon _every_ road that leads to things elevating for man; or to things promising for knowledge; or to things which, like dubious theories or imperfect attempts at systematizing, though neutral as regards knowledge, minister to what is greater than knowledge, viz., to intellectual _power_, to the augmented power of handling your materials, though with no more materials than before. In his geological and cosmological inquiries, in his casual speculations, the same quality of intellect betrays itself; the intellect that labors in sympathy with the laboring _nisus_ of these gladiatorial times; that works (and sees the necessity of working) the apparatus of many sciences towards a composite result; the intellect that retires in one direction only to make head in another; and that already is prefiguring the route beyond the barriers, whilst yet the gates are locked.

There was a man in the last century, and an eminent man too, who used to say, that whereas people in general pretended to admire astronomy as being essentially sublime, he for _his_ part looked upon all that sort of thing as a swindle; and, on the contrary, he regarded the solar system as decidedly vulgar; because the planets were all of them so infernally punctual, they kept time with such horrible precision, that they forced him, whether he would or no, to think of nothing but post- office clocks, mail-coaches, and book-keepers. Regularity may be beautiful, but it excludes the sublime. What he wished for was something like Lloyd's list.

_Comets_--due 3; arrived 1. _Mercury_, when last seen, appeared to be distressed; but made no signals. _Pallas_ and _Vesta_, not heard of for some time; supposed to have foundered. _Moon_, spoken last night through a heavy bank of clouds; out sixteen days: all right.

Now this poor man's misfortune was, to have lived in the days of mere planetary astronomy. At present, when our own little system, with all its grandeurs, has dwindled by comparison to a subordinate province, if any man is bold enough to say so, a poor shivering unit amongst myriads that are brighter, we ought no longer to talk of astronomy, but of _the astronomies_. There is the planetary, the cometary, the sidereal, perhaps also others; as, for instance, even yet the nebular; because, though Lord Rosse has smitten it with the son of Amram's rod, has made it open, and cloven a path through it, yet other and more fearful _nebulæ_ may loom in sight, (if further improvements should be effected in the telescope,) that may puzzle even Lord Rosse. And when he tells his _famulus_--'Fire a shot at that strange fellow, and make him show his colors,' possibly the mighty stranger may disdain the summons. That would be vexatious: we should all be incensed at _that_. But no matter. What's a _nebula_, what's a world, more or less? In the spiritual heavens are many mansions: in the starry heavens, that are now unfolding and preparing to unfold before us, are many vacant areas upon which the astronomer may pitch his secret pavilion. He may dedicate himself to the service of the _Double Suns_; he has my license to devote his whole time to the quadruple system of suns in _Lyra_. Swammerdam spent his life in a ditch watching frogs and tadpoles; why may not an astronomer give nine lives, if he had them, to the watching of that awful appearance in _Hercules_, which pretends to some rights over our own unoffending system? Why may he not mount guard with public approbation, for the next fifty years, upon the zodiacal light, the interplanetary ether, and other rarities, which the professional body of astronomers would naturally keep (if they could) for their own private enjoyment? There is no want of variety now, nor in fact of irregularity: for the most exquisite clock-work, which from enormous distance _seems_ to go wrong, virtually for us _does_ go wrong; so that our friend of the last century, who complained of the solar system, would not need to do so any longer. There are anomalies enough to keep him cheerful. There are now even things to alarm us; for anything in the starry worlds that look suspicious, anything that ought _not_ to be there, is, for all purposes of frightening us, as good as a ghost.