18 



THE ROYAL SOCIETY OF CANADA 



These values have been plotted and the resultant graphs for the 

 different months are to be seen in Plate 1. Inspection of the tables or 



FUVTE NO 1 



ALL DAVS (90Ê-19I2. 



AGINCOUKT HORIZONTAL FOKC&, 



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of the figures discloses the fact that during the winter months the 

 amplitude of the range is smaller and the time of occurrence of phase 

 is later in the day. The extent to which the type of the curve varies 

 with the season is better seen by taking the March inequality and 

 drawing it to scale and on the same chart representing the December 

 and June inequalities on scales so related that the mean length of the 



