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



207 



Precession = — 



58 AurigcB. 

 Twelve observations (1837. 561) give, 

 8 = + 41° 58' 16". 86. 

 3".376 ; sec var. = — 0". 613; proper motion = — 0". 138. 



24 X rfR = - 24".75 

 K = 6.5578 



dr)i = — 1".03 

 dfi=— 0.157 



