On Perturbed Series, Especially in C III, B I and O IV

Consideration of possible extra-configurational perturbations in atomic spectral series shows that often some series are preferable to others for the determination of series limits. In particular: In C III, several $2snd{}_{}{}^3{}_{}{}^{}D$ terms are recalculated, but Edlén's series limit value is verified in spite of perturbations; in B I, the term values are increased by 90 ${\mathrm{cm}}^{-1\mathrm{}}$ or 0.011 volt, so that $\mathrm{B}\mathrm{I} 2s^{2}2p{}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}-\mathrm{B}\mathrm{II} 2s^2{}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}=66,930\mathrm{} {\mathrm{cm}}^{-1\mathrm{}}=8.257\mathrm{}$ volts; and in O IV, the old $5s{}_{}{}^2{}_{}{}^{}S_{\frac{1}{2}}^{}{}_{}{}^{}$ term is replaced by a new one at 85,440 ${\mathrm{cm}}^{-1\mathrm{}}$, $?4p{}_{}{}^2{}_{}{}^{}P$ and $?6f{}_{}{}^2{}_{}{}^{}F$ are repudiated, and $?7f{}_{}{}^2{}_{}{}^{}F$ and $?8f{}_{}{}^2{}_{}{}^{}F$ are verified.