seat and flung the shutters open to see where Varys and
But by far the strongest support of such a forecast as this is furnished by those stellar bodies which even now appear to have cooled to the final stage of star development and ceased to shine. Of this class examples in miniature are furnished by the earth and the smaller of its companion planets. But there are larger bodies of the same type out in stellar space--veritable "dark stars"--invisible, of course, yet nowadays clearly recognized.
The opening up of this "astronomy of the invisible" is another of the great achievements of the nineteenth century, and again it is Bessel to whom the honor of discovery is due. While testing his stars for parallax; that astute observer was led to infer, from certain unexplained aberrations of motion, that various stars, Sirius himself among the number, are accompanied by invisible companions, and in 1840 he definitely predicated the existence of such "dark stars." The correctness of the inference was shown twenty years later, when Alvan Clark, Jr., the American optician, while testing a new lens, discovered the companion of Sirius, which proved thus to be faintly luminous. Since then the existence of other and quite invisible star companions has been proved incontestably, not merely by renewed telescopic observations, but by the curious testimony of the ubiquitous spectroscope.
One of the most surprising accomplishments of that instrument is the power to record the flight of a luminous object directly in the line of vision. If the luminous body approaches swiftly, its Fraunhofer lines are shifted from their normal position towards the violet end of the spectrum; if it recedes, the lines shift in the opposite direction. The actual motion of stars whose distance is unknown may be measured in this way. But in certain cases the light lines are seen to oscillate on the spectrum at regular intervals. Obviously the star sending such light is alternately approaching and receding, and the inference that it is revolving about a companion is unavoidable. From this extraordinary test the orbital distance, relative mass, and actual speed of revolution of the absolutely invisible body may be determined. Thus the spectroscope, which deals only with light, makes paradoxical excursions into the realm of the invisible. What secrets may the stars hope to conceal when questioned by an instrument of such necromantic power?
But the spectroscope is not alone in this audacious assault upon the strongholds of nature. It has a worthy companion and assistant in the photographic film, whose efficient aid has been invoked by the astronomer even more recently. Pioneer work in celestial photography was, indeed, done by Arago in France and by the elder Draper in America in 1839, but the results then achieved were only tentative, and it was not till forty years later that the method assumed really important proportions. In 1880, Dr. Henry Draper, at Hastings-on-the-Hudson, made the first successful photograph of a nebula. Soon after, Dr. David Gill, at the Cape observatory, made fine photographs of a comet, and the flecks of starlight on his plates first suggested the possibilities of this method in charting the heavens.
Since then star-charting with the film has come virtually to supersede the old method. A concerted effort is being made by astronomers in various parts of the world to make a complete chart of the heavens, and before the close of our century this work will be accomplished, some fifty or sixty millions of visible stars being placed on record with a degree of accuracy hitherto unapproachable. Moreover, other millions of stars are brought to light by the negative, which are too distant or dim to be visible with any telescopic powers yet attained--a fact which wholly discredits all previous inferences as to the limits of our sidereal system. Hence, notwithstanding the wonderful instrumental advances of the nineteenth century, knowledge of the exact form and extent of our universe seems more unattainable than it seemed a century ago.
Yet the new instruments, while leaving so much untold, have revealed some vastly important secrets of cosmic structure. In particular, they have set at rest the long-standing doubts as to the real structure and position of the mysterious nebulae--those lazy masses, only two or three of them visible to the unaided eye, which the telescope reveals in almost limitless abundance, scattered everywhere among the stars, but grouped in particular about the poles of the stellar stream or disk which we call the Milky Way.
Herschel's later view, which held that some at least of the nebulae are composed of a "shining fluid," in process of condensation to form stars, was generally accepted for almost half a century. But in 1844, when Lord Rosse's great six-foot reflector--the largest telescope ever yet constructed--was turned on the nebulae, it made this hypothesis seem very doubtful. Just as Galileo's first lens had resolved the Milky Way into stars, just as Herschel had resolved nebulae that resisted all instruments but his own, so Lord Rosse's even greater reflector resolved others that would not yield to Herschel's largest mirror. It seemed a fair inference that with sufficient power, perhaps some day to be attained, all nebulae would yield, hence that all are in reality what Herschel had at first thought them-- vastly distant "island universes," composed of aggregations of stars, comparable to our own galactic system.
But the inference was wrong; for when the spectroscope was first applied to a nebula in 1864, by Dr. Huggins, it clearly showed the spectrum not of discrete stars, but of a great mass of glowing gases, hydrogen among others. More extended studies showed, it is true, that some nebulae give the continuous spectrum of solids or liquids, but the different types intermingle and grade into one another. Also, the closest affinity is shown between nebulae and stars. Some nebulae are found to contain stars, singly or in groups, in their actual midst; certain condensed "planetary" nebulae are scarcely to be distinguished from stars of the gaseous type; and recently the photographic film has shown the presence of nebulous matter about stars that to telescopic vision differ in no respect from the generality of their fellows in the galaxy. The familiar stars of the Pleiades cluster, for example, appear on the negative immersed in a hazy blur of light. All in all, the accumulated impressions of the photographic film reveal a prodigality of nebulous matter in the stellar system not hitherto even conjectured.
- composed. When we reached Lemuy we had much difficulty
- them and fromthem, we seek them, hold them, hate them,
- sense and yet there was a horribly unpleasant 'sensation'
- compelit <60> to go. It went as on the previous night,
- numbers. I never saw anything more obliging and humble
- we are tempted to call them philosophical rather than religious,
- having a devil in it, SO LONG AS WE KEEP OUR FOOT UPON
- more recent experience shows me to have been in a relation
- end of the apartment. A steady stream of dirty water was
- is the feeling I always have of a foreign presence, external
- something which the Christian par excellence, the mystic
- of themorning, the kiss of the breeze, or the bite of the
- mud-banks as the tide falls. They occasionally possess
- of my acquaintance, of his religious life. It seems to
- have that same prerogative of appearing real which objects
- this sense of the unreality of thingsmay become a carking
- slowly toward the north—he said nothing of the party
- and which I fancy many persons would also call the'consciousness
- meaning of an organ, to ask after itsmost peculiar and
- may be its ministers. Every one who isat all acquainted
- him sped the yellow figure, and right to the end. The seemingly
- well afford to let the minor notes and the uncertain border
- to the nature of the universe; and secondly that I needdo
- quiet, and for the time being my friends were quite forgotten,
- At certain seasons they catch also, in “corrales,”
- sets of experience is asgreat as the difference between
- reaction due to things of thought isnotoriously in many
- thou knowest what is best; let this or that be according
- the leadership of each to men whom he believed that he
- rarely findin a Jewish, and never in a Christian piece
- This is a complex, a tender, a submissive, and a graceful
- be strongly endowed with an inner capacity for magnetic
- barter. Money was scarcely worth anything, but their eagerness
- We may now lay it down as certain that in the distinctively
- is one of the cardinal facts in ourhuman constitution.
- or not? It is too insignificant for our instructionin any
- that she might honestly give him the answer that he demanded.
- not and dare not desire any consolation and release; but
- other, many as are the intermediate stages which different
- that morality pure and simple does not contain. Youmay
- the steps again, finding himself now nearly up to his armpits
- as true, but rather in the form of quasi-sensible realitiesdirectly
- go. It was the extremer casesthat I had in mind a little
- is an exceptionally intelligent reporter. He isentirely
- Was it, though, the ever beautiful blossoms of hollyhocks
- In our last lecture we had a glimpse of the way in which
- particularly uncouth part of his philosophy, but only to
- off anything. And thoudost cut off, as far as it is in
- And thus matters stood when, one hot night, Meriem, unable
- A brilliant school of interpretation of Greek mythology