AT KEW OBSERVATORY, 1890 TO 1900. 
217 
The amplitude of the diurnal inequality varies so much that it is difficult to 
recognise the difference in type between curves for the different seasons when drawn 
on the same scale. Fig. 4 shows the inequalities for the three seasons on different 
scales, so related that the mean of the 24-hourly ordinates is the same for each. 
This brings out very clearly the fact that the difference in type is mainly between 
7 p.m. and 9 a.m., i.e., during the hours when the diurnal movement is least 
conspicuous. 
YOL. CCVIII. —A. 2 F 
