54 Mr, Christie on the effects of temperature on 
azimuths, so reduced to their mean meridian, are to be cor- 
rected for the difference between the standard temperature 
and that of the magnets. By means of tables III. and IV, 
repeating the processes described for the reduction of the 
observations made in doors to the standard temperature 
I reduce these observed positions of the points of equilibrium 
to what would have been their positions had the temperature 
of the magnets been 6o® at each of the observations. These 
reductions are successively effected in the two following 
tables. 
