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



by reducing them to 1830, with the precession, &c., annexed to each star. When 

 possible, the proper motions are deduced by comparison with Airy's Greenwich 

 places. 



24. o* Canis Majoris. 



8 = — 23° 35' 23". 83. J. (Johnson). 



Precesslon = — 4". 846; sec var. = — 0".352; proper motion = -f"0 " -Oil- 



13xrfR = — 21".63 

 K = 5.2240 



rfR = — 1".16 

 C?;U = — 0.318 



15 Argus. 

 *8 = — 23°49'8". 58.(J. H.) 

 Precession = — 10". 051 ; sec var. = — 0". 317 ; proper motion = + 0".075. 



* Johnson's *...=: 7" .80 Henderson's i 



Had the first been used, the refractions would be 0".78 less ; <//*:= — ,0".306. 



= 9".36 



