36 



PROCEEDINGS OF THE AMERICAN ACADEMY 



Ep. E= 1867, Jan. 11 1.2 M. Z. Paris + 2*20 48.9 {E — 8534). 



For the earlier observations the reduction given by Argelander {Bonn 

 Observations, p. 347) are used, after reducing them to the above formula 

 by subtracting 35o'"- — 0.0749 J^. The sixth column gives the ordi- 

 nates of a smooth curve without points of inflection drawn through the 

 points whose abscissas and ordinates are respectively given in the third 

 and fifth columns. The last column gives the difference between the 

 fifth and sixth columns. 



TABLE XII. — Minima of Algol. 



The numbers in the last column nearly equal the accidental errors 

 of observation. There is a slight grouping of negative signs about 

 1860, and of positive signs soon after 1870. This could not be avoided 

 .without giving to the curve a point of inflection. The average value 

 of these residuals is about six minutes, which shows the accordance 

 to be expected from any assumed formula. 



