2G8 



PROCEEDINGS OF THE AMERICAN ACADEMY 



comparison stars of 8 Cephei, and the logarithms of two of these he 

 found differed by only one hundredth of a unit. Accordingly, we can 

 do no better than to draw a straight line nearly through the points 

 designated by these stars, or assume that the value of a grade is 

 constant. The columns of Table IX. have the same meaning as the 

 corresponding columns of the previous similar tables. 



TABLE IX. — CoMPARisoNT Stars for 5 Cepiiei. 



Table X. compares the various light cui-ves with theory. The 

 columns have the same meaning as those of Table V. The theoretical 

 values are computed by the formula, L = 72.1 -|- 20.0 sin {r — 45*^) 

 + 7.0 sin (2v — 120°) 



