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



217 



34 a Sagittarii. 



*h= - 26° 29' 55".31. (J.) 



Precession = -|- 3".889 ; sec var. = + 0".532 ; proper motion = — 0".093. 



17 X ^R = - 16".70 

 K = 6.7651 



dfji 



0".98 

 0.145 



* This star is doubtful. 



i by Airy (3 observations), . . . . . 

 Henderson (Edinburgh, 5 obs.), Bessel's Refraction, 



„ Cape, 



Maclear, Direct, 



„ Reflected, ...... 



Johnson, ........ 



67".52 



54 .66 

 58 .11 

 58 .17 

 57 .23 



55 .31 



VOL. XIX. 



2f 



