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 witli reference to the Moon's Hour- Angle, 167 Ixxv 



Aurora Borealis — 



List of Auroras 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 Auroras Observed near Midnight, 172 Ixxxi 



Variation of Frequency of the Aurora 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 B orealis, Ixxxii 



Note on the Theory of the Aurora Borealis, • 175 Ixxxiii 



Meteorological Results — 



Temperature of the Air — 



Mean Temperature at Makerstoun, witli Probable Error, 176 Ixxxiv 



Annual Variation, 177 Ixxxiv 



Probable Error of the Mean Temperature for any 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 Vapom — 



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 



