OF ARTS AND SCIENCES. 



171 



Classifying according to magnitude of probable error (1), — 



Class (a). All stars A A more than once observed. 

 All stars AB more than twice observed. 



20 pairs of class (a) 38°59'41''61 



PEoflpair(l) ±0.31 



(2) ±0.468 



Class (y3). All stars AB twice observed. 



All stars BB more than twice observed. 



8 pairs of class (j3) 38°59'41//41 



PEoflpair(l) ±0.38 



(2) ±0.28 



Class (7) All stars once observed 38°59'41'/46 



All stars AC, BC. 



23 pairs of class (y) 



PEoflpair(l) ±0.46 



(2) ±0.605 



