On Diurnal Variation of Barometric Pressure. 



19 



Table V. 



Observed and calculated values of a^ and ^, as the function of the longitude. 



• It must be remarked that a difficulty is often met with in taking the mean value of ^i, 

 since the actual values for different stations in the same group vary widely and it becomes 

 in such cases uncertain whether <pi as such or 2'k — \jii is to be taken in calculating^the mean 

 value. Some of the values here tabulated are therefore more or less affected by an arbitrary 

 choice in the case of ambiguity. The influence is not serious for groups with large number 

 of stations. 



