252 Mr Freeman, On a table showing the time, &c. [May 29, 1882. 



The hour angles and zenith distances in the Table are those which would 

 geometrically correspond to the given polar distances; the refractions, calcu- 

 lated from Bessel's mean refractions, are to be deducted from the tabular zenith 

 distances if the apparent zenith distances be required. 



