Appendix Ii.: List of Objects for the Telescope 278

INDEX 285

LIST OF ILLUSTRATIONS

PRINTED SEPARATELY FROM THE TEXT

PLATE To face page

I. The 40-inch Refractor of the Yerkes Observatory [Frontispiece

II. Six-inch Photo-Visual Refractor, equatorially mounted 30

III. Twenty-inch Reflector, Stanmore Observatory 36

IV. Telescope House and 8-1/2-inch 'With' Reflector 38

V. The Sun, February 3, 1905. Royal Observatory, Greenwich 48

VI. Photograph of Bridged Sunspot (Janssen). Knowledge, February, 1890 50

VII. Solar Surface with Faculæ. Yerkes Observatory 60

VIII. Coronal Streamers: Eclipse of 1898. From Photographs by Mrs. Maunder 70

IX. The Chromosphere and Prominences, April 11, 1894. Photographed by M. H. Deslandres 74

X. Venus. H. MacEwen. Five-inch Refractor 94

XI. The Moon, April 5, 1900. Paris Observatory 102

XII. The Moon, November 13, 1902. Paris Observatory 108

XIII. The Moon, September 12, 1903. Paris Observatory 110

XIV. Region of Maginus: Overlapping Craters. Paris Observatory 112

XV. Clavius, Tycho, and Mare Nubium. Yerkes Observatory 114

XVI. Region of Theophilus and Altai Mountains. Yerkes Observatory 116

XVII. Apennines, Alps, and Caucasus. Paris Observatory 118

XVIII. Chart of the Moon. Nasmyth and Carpenter } } 124 XIX. Key to Chart of Moon. Nasmyth and Carpenter }

XX. Mars: Drawing 1, January 30, 1899--12 hours. Drawing 2, April 22, 1903--10 hours 134

XXI. Chart of Mars. Memoirs of the British Astronomical Association, Vol. XI., Part III., Plate VI. 138

XXII. Jupiter, January 6, 1906--8 hours 20 minutes. Instrument, 9-1/4-inch Reflector 158

XXIII. Jupiter, February 17, 1906. J. Baikie, 18-inch Reflector 166

XXIV. Saturn, July 2, 1894. E. E. Barnard, 36-inch Equatorial 172

XXV. Great Comet. Photographed May 5, 1901, with the 13-inch Astrographic Refractor of the Royal Observatory, Cape of Good Hope 210

XXVI. Photographs of Swift's Comet. By Professor E. E. Barnard 220

XXVII. Region of the Milky Way in Sagittarius, showing a Double Black Aperture. Photographed by Professor E. E. Barnard 232

XXVIII. Irregular Star Clusters. Photographed by E. E. Barnard 256

XXIX. Cluster M. 13 Herculis. Photographed by Mr. W. E. Wilson 258

XXX. Photograph of the Orion Nebula (W. H. Pickering) 262

XXXI. Photographs of Spiral Nebulæ. By Dr. Max Wolf 264

XXXII. Photograph of Whirlpool Nebula (M. 51). Taken by Mr. W. E. Wilson, March 6, 1897 266

LIST OF ILLUSTRATIONS

PRINTED IN THE TEXT

FIG. PAGE

1. Principle of Galilean Telescope 3 2. Principle of Common Refractor 3 3. Dorpat Refractor 7 4. Thirty-inch Refractor, Pulkowa Observatory 9 5. Principle of Newtonian Reflector 11 6. Lord Rosse's Telescope 12 7. Herschel's 4-foot Reflector 13 8. Star--Correct and Incorrect Adjustment 21 9. Small Telescope on Pillar and Claw Stand 26 10. Telescope on Tripod, with Finder and Slow Motions 27 11. Equatorial Mounting for Small Telescope 29 12. Eight-inch Refractor on Equatorial Mounting 32 13. Four-foot Reflector, equatorially mounted 36 14. Drawing of Sunspot 52 15. " " 53 16. " " 56 17. " " 57 18. " " 58 19. Eclipses of the Sun and Moon 69 20. Mercury as a Morning Star. W. F. Denning, 10-inch Reflector 84 21. The Tides 101 22. Lunar Craters 105 23. " " 118 24. Mars 146 25. Jupiter 157 26. Saturn 183

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