L'université de fireside de l'invention moderne, de la découverte, de l'industrie et de l'art pour l'étude et le divertissement de cercle à la maison. Il Sodiums lumière en même temps, il madethe Fraunhofer lignes s'adaptent l'un sur l'autre. De cette façon, il sug-gésait la présence de sodium, de fer, de calcium, de magnésium, de nickel, de baryum, de cuivre, de zinc et de cobalt au soleil. Pourquoi les lignes de soleil sont-elles sombres, alors que les mêmes éléments^brûlant sur terre, jettent des lignes lumineuses ? Il est expliqué sur la théorie que le sodium, en brûlant sur le thesun, fait une ombre par comparaison avec la puissance vive de la lumière autour de lui. Le poète persan imaginait la gloire de Dieu à

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The fireside university of modern invention, discovery, industry and art for home circle study and entertainment . he Sodiums light at the same time, he madethe Fraunhofer lines fit on one another. In this way he sug-gested the presence of Sodium, Iron, Calcium, Magnesium, Nickel, Barium, Copper, Zinc and Cobalt on the sun. Why are the suns lines dark, while the same Elements^burning on earth, throw bright lines ? It is explained on the theory that Sodium, in burning on thesun, makes a shadow by comparison with the vivid power of the light around it. The Persian poet imaginedthe glory of God to be such that the sunitself was His shadow. Did the study progress ? Very rapidly. Professor Crookes, ofthe celebrated X Ray tubes, was one ofthe most successful experimenters, succeed-ing in lighting the Elements by the electricspark and noting the map of their Spectra.In 1861 he thus discovered Thallium. What ^wonderful result followed? The Spectroscopists found lines on thesuns Spectrum that were not present in anylight given on earth. They thereforenamed the two sources of these Lines Helium and Coronium.. Fig. TO. HERRMANNSHEMOSCOPE, or BLOOD-TESTING APPARATUS. THE SPECTROSCOPE: 219 Helios is the Greek name for the sun. In 1895 Lord Rayleigh, who had isolated the Element Argon, a gas, announced that inisolating Argon he had found the Spectrum of Helium, andsoon Helium was isolated by several chemists. Thus one of ourElements was first recognized at a distance of ninety-five millionmiles from the earth. No Gold is found on the sun. Are the Stars studied? Yes. They have been classified into stars like our sun thatshow many metals. Capella, in the Constellation Auriga, showsmany metals. There is a large class like Sirius, that show moregas than our sun, principally Hydrogen. The third class showIron, and their Lines are like those of the suns spots. They arebelieved to be cooling into a molten condition. What is the most interesting result of the Spectral Analysisof tlie stars

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