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CONTENTS. 
Annual Variations— 
Mean Vertical Component,-++-++-+:++.seeseesssernenecseeereeeaecseeeeneeneeneenenees 
Mean Change of the Vertical Component from Month to Month,:-----...++. 
Effect of Disturbances on the Monthly Means, ---+-++..+++ssseessss severe scenes 
Difference of the Daily Means from the Monthly Means, ---+++++++++++++++08 
Diurnal Ranges, --++eeseceeseee ec eceeseesec een eesee er cceeeseeseeceeecseeecaseeeewseenees 
Ranges of the Monthly Mean Diurnal Variations from all the Observations, 
and from Selected Days, Natehdiaiwtdiaate)st gainiafe Oui «'elatas ide aicle stab ie a tv afecia'e eeta riaiwiebtot Ts 
General Law of the Ranges of the Undisturbed Mean Diurnal Variation, 
Mean Difference of an Observation from the Monthly Mean,.---..+++-..+++++ 
Number of Observations greater than the Monthly Mean,.-+.---..+..++++++++ 
Monthly Variations— 
Mean Vertical Component, inhiete lodied aaa nad toed « ckicisivina ala aieiniesichin mamdiiene Meera oe 
Diurnal Ranges, -::ccessscoeseseceeeeccnseeeen cesses sssaeeceeersseeencesu ens cusseueasens 
Mean Difference of an Observation from the Monthly Mean, -..---+--.-.++-+- 
Diurnal Variations— 
Results from all the Observations, for each Month--++-+++++++sseseeeeeeeeeeeers 
Results from all the Observations, for Groups of Months,---.++--++-++++1+-+0 
Results from Undisturbed Observations, for Groups of Months, «-:---+--.-- 
Effect of Disturbance on the Hourly Means, «--+++1+-+eeesseeeeeeseeeseeereeee ees 
Frequency of Positive and Negative Departures from the Hourly Mean 
Position, Pee ee ee ere errr 
Mean Difference of an Observation from the Monthly Mean Position for 
each Hour, ae da ota ulviaioln a'elatula'e v'diwialete aalu/a'sis’a ateltvin wie adla'wnminhahi/a siege] damistonl 
Mean Difference from Undisturbed Mean Positions for each Hour, -----+--. 
Variations with reference to the Moon’s Hour-Angle, «--++-++++++1-+1seereeeee 
Macnetic Dip— 
Places of Observation for Different Epochs and General Remarks, --------- 
Observations in 1849 on Original Dip-Pillar, --++--+--++--ssseeseeeeeeeeeeeseeeee 
Observations to determine Local Error, --+++++++++-se+ereeeeeeseceeeeeee eee eee ees 
Secular Change, ees lortieinta.> ola cieletsiviac madsen van Cusiaaln seasthes sense erste 
Result of Observations with Inclinometer in different Azimuths, -----.----+- 
Observations with the Inclinometer of the Royal Society of Edinburgh, --- 
Variations of Magnetic Dip, deduced from the two Component Magnetometers— 
Similarity between Results for Magnetic Dip and for Horizontal Com- 
POMENE, ccesrererereeee eer eeesceece eee eeeeeccneteeeeeeesaeerssccesseasetesceseceeeees 
Secular Change, -::+--sesseecsssessenceecrsseeeeece seen eneeeee eens sseeasecstareaeeans 
Effect of Disturbance on the Yearly Mean, ---+++..-+++s+eesseereeeeecenseeeneres 
Annual Period, from all the Observations, --++-++-+++s+++eseeeeseneeeneneeeeeeens 
Annual Period, from Undisturbed Observations, «+++++s++-eseenseeereeees reece 
Annual Variation of Ranges of Monthly Mean Diurnal Variation, -----.--- 
Variations of Magnetic Dip with the Moon’s Age,+-+--.+:+++s+-ssereesrreeese ees 
NO. 
