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76 HALLS ILLUSTRATED CATALOGUE OF NEW SCIENTIFIC SLIDES. Finely colored Views. $1.50 each. Mounted in slider. SPECTRUM ANALYSIS. 1. Decomposition of Light by Prism. SOLAR SPECTRUM. 2. Comparative intensity of heating luminous and chemically active rays in spectrum. 3. Fraunhofer's Map of Solar Spec- trum. 4. The Spectroscope. ."». Spectra of the Sun, Beta Cygni and Hydrogen. G. Spectra of Potassium, Rubidium, Sodium, and Lithium. 7. Spectra o f Carbon, Comet II. (1868), Spark and Nebulae. 8 Spectra of Aldebaran and Alpha Orionis. 9. Kirchoff's Map of (from 194 to 220) and Rutherford's Map of same. 10. Spectra of chlorophyll, chloride of Uranium, Magenta and Blood. Gassiot's Spectroscope, made by Browning. Huggins' Map of Metallic lines, from 320 to 2790. Huggins' Map of Metallic lines, from 2790 to 5250. Huggins' Star Spectroscope. Map of Solar Spectrum, 38 to 163. " " " " 162 " 287. " « « c; 283 " 406. Coincidence of Spectrum of iron, with 65 of the Fraunhofer lines. Spectra of the Sun, Chromos- phere, Prominences and Co- rona. The Atmospheric Lines. 11. 12. 13. 14. 15. Id. 17. 18. l'.i. 20 ASTRONOMY.—Set No. i. Movable Astronomical Diagrams, by rack-work motion. 1. The Solar System, showing the revolution of all the Planets with their Satellites, round the Sun. 2. The Earth's annual motion round the Sun, showing the Parallel- isms of its axis, thus producing the seasons. ?>. The cause of Spring and Neap Tides, and the Moon's phases during its revolution. 4. The apparent Direct and Retro- grade Motions of Venus or Mercury, and its stationary ap- pearance. 5. Proving the rodundity of the Earth by a ship sailing round the Globe, and a line drawn from the Eye of an Observer. 6. The Eccentric Revolution of a Comet round the Sun, and the appearance of its tail at differ- ent points of its orbit. 7. The Diurnal motion of the Earth, showing rising and setting of the Sun, and the cause of Day and Night. 8. The Annual motion of the Earth round the Sun, with the monthly lunations of the Moon. 9. The various Eclipses of the Sun, with the Transit of Venus. 10. The various Eclipses of the Moou. Price in box, with Lantern, $40.00. Set No. 2. A set of 38 finely colored Astronomical Diagrams, in box, with Lec- ture, $20.00.