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28 ASTRONOMY. ASTRONOMY" PART l.-THE SUN. S lagT&m of the Solar System, elative Bites of the Sun and Planets. 8 Apparent size of Sun, as seen from Planets. 4 Solar disc, seen by projection. & Unequal brightness of the Solar surfaca. 8 Telescopic view of Solar disc. 7 Photo-heliogTaph. fSecchi). 8 Photo-heliograph. (Kew). 9 Irregularities of the Solar surface. 19 Solar “ Willow-leaves. (Nasmyth). 11 Solar “ Granules. (Huggins). IS Minute structure of Solar surface. (Langley) 13 Views of Sun Spots. No. 1. 14 Views of Sun Spota. No. 2. 15 Views of Sun Spota. No. 3. 16 Views of Sun Spots. No. 4. IT The gTeat Sun Spot of 1835. (Howktt> 18 Typical Sun Spot. (Langley). 19 Faculse near Sun Spot. 90 Zones of Sun Spots. 91 Bun Spots apparently depressions. S3 Wilson's Theory of Sun Spots. S3 Herschel’s Theory of Sun Spots. 24 Curve of Sun Spot frequency. (Wei/)- 25 Connection of Sun Spots with Auroras and Magnetic Phenomena. 2C Decomposition of Sun-light by pri3m. 27 Unequal refrangibility of different colours. 28 Necessity for use of narrow slit. 39 Spectroscope, with reflected scale. 80 Increased dispersion by series of prisma 81 Solar Spectroscope. (Secchi). 82 Solar Spectrum. (Fraunhofer). 83 Solar Spectrum. (Kirchhoff). 84 Solar Spectrum ; Photograph, by Diaper. 85 Reversal of Sodium lines on Screen. 88 Coincidences of Fraunhofer liues with those •a of 8odium, &c. £7 Coincidences of Fraunhofer i ham with thou of Iron. N Telluric lines in Solar Spectrum. Spectrum of Sun Spot (Secch& 40 Spectrum of Sun Spot near D linos. 41 Thickening of D lines in Sun Spot. 42 Total and annular Eclipses of the Sun. 43 Solar Eclipses. 1S36 to 18G0. (6 views) 44 Total Solar Eclipse. No. 1. 1833. 45 Total Solar Eclipse. No. 2. 1SG9. 43 Total Solar Eclipse. No. 3 1869 47 Total Solar Eclipse. No. 4. 1869. 48 Total Solar Eclipse. No. 5. 1870. 49 Total Solar Eclipse. No. 6. 1870. 50 Total Solar Eclipse. No. 7. 1870. 51 Total Solar Eclipse. No. 8. 1871. 52 Total Solar Eclipse. No. 9. 1876. 53 Total Solar Eclipse. No. 10. 54 General view of Chromosphere. 65 Views of Solar Prominences. No 1. (ZSGneri 6G Views of Solar Prominences. No. 2. (Kesri'hO 67 Views of Solar Prominences. No. 3. (Lockyer) 58 Views of Solar Promi nonces. No. 4. (Young) 59 Views of Solar Prominences. No. 5. 60 Views of Solar Prominences. No. 6. 61 Solar Prominences; examined with RsdM slit 62 Spectra of Solar Prominences. (Lockyer). 63 Various Spectra of Solar Prominences. 64 Solar Prominences; examined with Tangen- tial slit 65 Solar Prominences; Been entire, by aaa o! wide slit. 66 Long and short lines in Solar Promlneaeea. 67 Solar Cyclones. (Lockyor). G3 “ Motion Forms. (Lockyer). 69 F line, in Sirius and the Sun. 70 Measurement of velocity, by displsceminli of F line. 71 Spectra of Sun, Corona, and Aurora Borealis. 72 Thermal, lumiuous, and actinic ray» in Solar Spectrum. 78 Thermal intensities in Spectra of the Sas and of the Electric Light 74 Pyrheliometer. 75 Apparatus for photographing Solar Spectra®