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



215 



23 X ofR = + 7".92 

 K= 6.1035 



c?K = + 0".34 

 dfx=z-{- 0.056 



Antares. 



* 8 = — 26° 2' 47". 69. (J. and H.) 



Precession = — 8".556 ; sec var. = -\- 0".487 ; proper motion = — 0".031. 



♦ Airy, »(18 obs. in 36 and 37) . 48".ll Argelander 



Henderson . . . . 48 .68 Mine 



Johnson, . . . . 46 .71 



46".50 

 47 .44 



