204 



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



17 AndromedcB. 



Fifteen observations (1838. 801) give, 



S = +42° 19' 39". 41. 



Precession = -\- 19". 883 ; sec var. = -\- 0.051 ; proper motion = -\- 0.042. 



14 X </r = — 6".59 dii = — 0".47 



K = 6.2444 dfx=— 0.075 



10 UrscB Majoris. 



Twelve observations (1837. 932) give, 



*8 = + 42° 26' 58". 89. 



Precession = — 13". 522 ; sec var. = — 0". 418 ; proper motion = — 0". 294. 



Argelander's *= 57". 80 ; proper motion =: - 0". 286. 



