The Rev. Dr. Robinson on the Constant of Refraction. 



199 



P.XXI. 157 Cygni. 



Fifteen observations (1838. 800) give, 



*8 for 1838. Jan. 1, = + 45° 42' 55". 74. 



Precession = + 15".586. 



8 X <^R = + 0".62 

 K = 4 .0544 



Jr = 4- 0".077 

 dfi = -\-0 .019 



22. Andromedce. 



Eleven observations (1838. 337) give, 



8 = + 45° 7' 33". 65. 



Precession = + 20". 056 ; sec var. = — 0". 009 ; proper motion = + 0."005. 



* This star has not been reduced to 1830, as I am doubtful of Piazzi's place ; the right ascension 

 which he gives is also erroneous. 



It is rather too faint for subpolar observation here. 



