M.-P.-VOL. I.] CRA WFORD- CONSTANT OF REFRA CTION. 



The first and second of these are determinations by 

 Bessel; the third by Gylden; the fifth by Stone; the 

 sixth by Nyren; the seventh by Newcomb; the eighth by 

 Nyren; and the last by Bauschinger. 



Bauschinger gives weight zero to each of Bessel's 

 determinations; to the first, because there was considerable 

 uncertainty in Bradley's meteorological instruments; to the 

 second, because of the uncertainty in reading the Meridian 

 Circle (read by vernier to one second). He gives equal 

 weight to the last seven, and gets for a mean 



a = 60". 1 53 and i*> = 1.00029176. 



5. Latitude. The following table gives the value of 

 <f deduced separately from the southern and from the 

 northern stars. All of the stars of the list down to 

 84 Z. D. were used. 



V --= + 37 20' 



Applying the new refractions found here, the latitudes 

 become from the 



Southern Stars <p =25''. 55 



Northern Stars <p = 25 .19 

 giving for the mean <p at this epoch (1899 June 22), 



f -4 37 20' 25". 3 7. 



