CHAPTER VI

THE VARIATION OF LATITUDE 177

INDEX 221

LIST OF PLATES

PLATE

I. PORTRAIT OF J. C. ADAMS _To face page_ 22

II. PORTRAIT OF A. GRAHAM " " 22

III. PORTRAIT OF U. J. LE VERRIER " " 60

IV. PORTRAIT OF J. G. GALLE " " 60

V. CORNER OF THE BERLIN MAP BY THE USE OF WHICH GALLE FOUND NEPTUNE " " 82

VI. ASTRONOMERS ROYAL _Frontispiece_

VII. GREAT COMET OF NOV. 7, 1882 _To face page_ 122

VIII. THE OXFORD NEW STAR " " 142

IX. NEBULOSITY ROUND NOVA PERSEI " " 146

X. SUN-SPOTS AT GREENWICH, FEB. 18 AND 19, 1894 " " 158

XI. SUN-SPOTS AT GREENWICH, FEB. 20 AND 21, 1894 " " 162

XII. NUMBER OF SUN-SPOTS COMPARED WITH DAILY RANGE OF MAGNETIC DECLINATION AND DAILY RANGE OF MAGNETIC HORIZONTAL FORCE " " 164

XIII. GREENWICH MAGNETIC CURVES, 1859-60 " " 166

XIV. GREENWICH MAGNETIC CURVES, 1841-1860 " " 166

XV. SUN-SPOTS AND TURNS OF VANE " " 170

ERRATA

Page 133, line 27, _for_ "200 stars" _read_ "200 stars per hour."

" 145, See note on page 220.

" 146, bottom of page. This nebulosity was first discovered by Dr. Max Wolf of Heidelberg. See _Astr. Nachr._ 3736.

" 181, line 17, _for_ "observation" _read_ "aberration."

ASTRONOMICAL DISCOVERY