214 



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



Precession 

 0".012. (A.) 



^ Argus. 



♦8 =—24° 26' 17".90. (J.) 

 8".647 ; sec. var. = — 0".329 ; proper motion 



13 X <^R = — 21".87 

 K = 5.7931 



ds. = — V'M 

 diMz=— 0.290 



22 \ Sagittarii. 

 f 8 = — 25° 30' 23". 90. (J.) 



Precession = + l".528 ; sec. var. = -|-0".537; proper motion = —0".291. (J.) 



• Airy (15 observations, 1836-7) . 18".93 

 f The declinations of this star are discordant : 

 Airy (16 in 1837) .... 25".79 

 Johnson , . . . 23 .90 



Maclear 



24".45 



