M.-P.— Vol. I.] CRAWFORD-CONSTANT OF REFRACTION. 



I 9 I 



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". 153 and p = 1. 00029176. 



5. Latittide. — The following table gives the value of 

 <p deduced separately from the southern and from the 

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

 84 Z. D. were used. 



<P = + 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), 



9 = 4 37° 20' 25". 37. 



