In order to investigate this latter point we must look into the formulæ for the revolutional frequency ω in a stationary orbit and for the radiation frequency ν. Since, according to the Bohr theory, we can apply the usual laws of mechanics to revolution in a stationary orbit, it is an easy matter to find an expression for ω. From a short mathematical calculation we can deduce that ω = R/_n_³, where R is the frequency of revolution for the first orbit (_n_ = 1). We find ν, on the other hand, by substituting in the Balmer-Ritz formula the numbers _n_ and _n_ - 1, and a simple calculation shows that for great values of _n_, the expression for ν will approach in the limit the simple form ν = 2K/_n_&sup3. For large orbit numbers, ν accordingly varies as ω, _i.e._, inversely proportional to the third power of n, and by equating R and 2K, we find that the values for ν and ω tend more and more to become equal. In this way the value of K, the Balmer constant, may be computed. It is found that _m_ K = 2π²_e_⁴----- _h_³ where _e_ is the charge on the electron, _m_ the mass of the electron, and _h_ is Planck’s constant. Upon the substitution of the experimental values for these quantities, a value of K is determined which agrees with the experimental value (from the spectral lines investigation) of 3·29 × 10¹⁵ within the accuracy to which _e_, _m_ and _h_ are obtainable. This agreement has from the very first been a significant support for the Bohr theory.