OF ARTS AND SCIENCES. 



381 



The last two lines give the mean results in logarithms and in mag- 

 n /tildes. 



TABLE V. — Comparison St.vrs of /3 Persei. 



The eighth and ninth columns show that the agreement of our 

 measures with the estimates of Schonfeld is better than that of either 

 Seidel or Wolff. This is the case even when the value of g is de- 

 rived from the measures of these observers. The last column shows 

 that a curve could be made to follow the observations almost exactly, 

 the small deviations being allowed rather than that too sharp a change 

 of curvature should be given to the curve. 



The form of light-curve deduced from the above measures is shown 

 in Table VI. The first column gives the time, and the second the 

 corresponding magnitude, found by reading the ordiuates of the curve 

 drawn through the observed points as described above. A correction 

 to the ephemeris of thirty-seven minutes in the time of minimum 

 is assumed, and the points correspond to intervals of thirty minutes 

 from this time. The logarithm of the light is given in the third 

 column, and is found by multiplying the magnitudes by 0.4 and sub- 

 tracting 1.068. The relative intensity of the light compared with the 

 full brightness is given in the next column. The observations of 

 Schonfeld are next reduced by assuming the value of g to be succes- 

 sively 0.025 and 0.029 ; and, thirdly, by means of the curve described 

 on page 380. The residuals in the last three columns are found by 

 subtracting the logarithms given in the third column from these three 

 sets of values. 



