218 



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



c Canis. 



*8 = — 28° 44' 45". 35 (J. and H.) 



Precession = — 4". 507 ; sec var. = — 0". 333 ; proper motion = — 0". Oil. 



I6xdn = — 18".85. rfa = — 1".18. 



K = 8.6376. dfi=- 0.136. 



SI r] Cants Majoris. 



n = — 28° 58' 35". 79 (J.) 



Precession = — 6". 642 ; sec var. = — 0". 323 ; proper motion = — 0".011. 



* * by Airy (26 obs.) . . 46".38 Henderson, Cape, . . . 46".36 



■\ Henderson's declination is a second greater, but rests on a much less number of obser- 

 vations. 



