44 



AUT. 19. N. ICIIINOHE I 



The period and the nitio do not show any conclusive relations 

 with the maxiiiiiun brightness and the range of variation. 



(d) DENSITY. 



Finding the relation existing between the period and the 

 ratio between the period and the duration of the eclipse, we can 

 pass througli to the relation between the period and the density, 

 as we have two equations 



and 



r = 



1 



0.082+ ^^ 



If we can suppose that the latter relation is fully establislied, 

 D„j will simply be a function of the period only, as the ratio will 

 be expressed by the period. The similar investigation, with the 

 relation between the period and the ratio, of the density from 

 Table II, will give us the first two columns in the next tables. 



TABLE XII. 



