CONTENTS. ix 
NO. PAGE 
General Form and Turning Points of the Diurnal Motions, 163 Ixxiii 
Angular Distances between the Disturbed and Undisturbed Hourly Mean 
Positions, 165 Ixxiii 
Motions with reference to the Moon's Hour-Angle, 167 Ixxv 
Aurora Borealis — 
List of AurorEe Boreales seen at Makerstoun in the years 1843-9, 169 Ixxv 
Additional Notes on Aurora Borealis seen in 1847-9, 170 Ixxix 
Diurnal Variations of Visible Frequency of the Aurora Borealis, 171 Ixxxi 
Annual Variation of Frequency of the Aurora Borealis, 172 Ixxxi 
Foot-note on Results of Mairan, Kamtz, and Hansteen, Ixxxi 
Annual Variation from Aurorse Observed near Midnight, 172 Ixxxi 
Variation of Frequency of the Am-ora Borealis with the Moon's Age, 173 Ixxxii 
Foot-note on the Preferability of Mean Latitudes for the Determination 
of the Laws of Frequency of the Aurora Borealis, Ixxxii 
Note on the Theory of the Aurora Borealis, 175 Ixxxiii 
Meteorological Results — 
Temperature of the Ait — 
Mean Temperature at Makerstoun, with Probable Error, 176 Ixxxiv 
Annual Variation, 177 Ixxxiv 
Probable Error of the Mean Temperature for anj^ Month, 178 Ixxxv 
Annual Variation of the Diurnal Range of Temperature, and the Ranges 
of the Mean Diurnal Variations, 179 Ixxxv 
Differences of the Daily Mean Temperature from the Monthly Mean, 180 Ixxxvi 
Diurnal Variation of Temperature, 182 Ixxxvi 
Pressure of Aqueous Vapour — 
Annual Variation, 183 Ixxxvii 
Variations with Reference to the Moon's Age and Declination 184 Ixxxvii 
Diurnal Variation, 185 Ixxxviii 
Relative Humidity — 
Annual Variation, 186 Ixxxix 
Variations with Reference to the Moon's Age and Declination, 187 Ixxxix 
Diurnal Variation, •• • 188 xc 
Atmospheric Pressure — 
Mean Atmospheric Pressure at Makerstoun, 189 xc 
Annual Variation, and Probable Error for each Month, • 190 xci 
Foot-note on the Differences of Mean Pressure at Greenwich and Maker- 
stoun, xci 
Quarters giving greatest Range of Mean Pressure, 191 xci 
Annual Variation of Differences of the Daily Mean from the Monthly 
Mean Pressures, • • • 192 xcii 
b 
