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It is quite probable, moreover, that the heat of Arcturus exceeds the solar heat in the same ratio, for the spectroscope shows that although Arcturus is surrounded with a cloak of metallic vapors proportionately far more extensive than the sun's, yet, smothered as the great star seems in some respects to be, it rivals Sirius itself in the intensity of its radiant energy.
Still, however beautiful and interesting such results may be, it might well be thought that they could never have any practical application, and that the spectroscope at least would remain an instrument of science, but of science alone. This, however, is not the case. Some thirty years since, Mr.
Both shine in the same way, both are so faint and thin that stars can be seen through them; but the spectroscope shows us that to carry the idea too far would be wrong, as there are many differences in constitution. We have seen that there are dark stars as well as light stars; if so, may there not be dark nebulæ as well as light ones? It may very well be so.
By them we now study the composition of the atmospheres of the other planets; through them the presence of chemical elements known on the earth is detected in vagrant comets, far-distant stars and dimly-shining nebulae. The spectroscope also makes it possible to measure the velocities of objects which are approaching or receding from us.
Very likely; but I was seeking information on the strange light, and as I could not find any I resolved to walk over and consult my old friend, Professor Gazen, the well-known astronomer, who had made his mark by a series of splendid researches with the spectroscope into the constitution of the sun and other celestial bodies. It was a fine clear night.
At first it had been thought possible to examine them only in sections that is, by admitting mere narrow strips or "lines" of their various kinds of light; while the actual shape of the objects emitting those lines had been arrived at by such imperfect devices as that of giving to the slit of the spectroscope a vibratory moment rapid enough to enable the eye to retain the impression of one part while others were successively presented to it.
It brought out the nature of the spectroscope in a remarkably clear and intelligent light, and after a few rounds I am sure none of us could ever again have forgotten those elusive figures relative to the distances and proportions of the planets. However, that must be for another time.
Then if a hydrocarbon is present, the passage of a spark from a Ruhmkorff's coil will cause the appearance of a sky-blue light. Viewed with the spectroscope, this presents the spectrum of carbon, and generally so brilliant as to mask totally the spectra of other gases present. The rare metals cerium, lauthanum, and didymium have been lately investigated by Drs.
In 1866 one of the second magnitude broke forth in the ``Northern Crown'' and awoke much interest, because by that time the spectroscope had begun to be employed in studying the composition of the stars, and Huggins demonstrated that the new star consisted largely of incandescent hydrogen. But this star, apparently unlike the others mentioned, was not absolutely new.
=Chlorate of Potassium= produces irritation of stomach and bowels; hæmaturia; melæna; cyanosis, weakness, delirium, and coma. Post-Mortem. Blood is chocolate-brown in colour, and so are all the internal organs; gastro-enteritis; nephritis. Tests. Spectroscope shows blood contains methæmoglobin; the drug discharges the colour of indigo in acid solution with SO . Treatment.
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