198 



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



Capella. 

 Eighteen observations (1837. 65) give, 

 *8 = +45°48'54".12. 

 Precession = + 4.840 ; sec var. = — 0".627 ; proper motion = — 0".472. 



20 X e^E = — 15".86 

 K = 3.7318 



<^R = — 0".79 

 dn = — 0. 212 



